My engine light came on and i stopped by advance auto to get a scan and it showed a Po171 right bank lean.....is this an O2 sensor going bad ?

highway

most likly MAF clear it and see if it comes back

_________________

92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

EDIT: Looked under the hood when she got home and the lid to the airbox had came unsnapped and was a small gap there. I'm going to clean the throttle body and MAF sensor after i saw what had happened


Highway

Really, those Advance Auto code retrievers don't do much. You really need a scan so you can see what your sensors are actually reading. My first bet goes to the 02 sensor, but that is only an educated guess.

_________________
Six-speed top-swapped GT, sold.
2006 F-150 4x4 for a daily driver.

http://www.gpona.com/forums/garage.php

please fill this out, as it helps me and others who look up the codes because we need year, make and model

DTC P0171 Fuel Trim System Lean
Circuit Description

In order to provide the best possible combination of driveability, fuel economy, and emissions control, a closed loop air-to-fuel metering system is used. While in closed loop, the powertrain control module (PCM) monitors the HO2S 1 signal and adjusts the fuel delivery based upon the HO2S signal voltage. A change made to fuel delivery will be indicated by the long-term and the short-term fuel trim (FT) values, which can be monitored with a scan tool. The ideal fuel trim values are approximately 0 percent. If the HO2S signals indicate a lean condition, the PCM will add fuel, resulting in fuel trim values that are more than 0 percent. If a rich condition is detected, the fuel trim values will be less than 0 percent, indicating that the PCM is reducing the amount of fuel delivered. If an excessively lean condition is detected, DTC P0171 will set .

The maximum authority of the PCM to control long-term FT allows a range between -23 percent and +16 percent. The maximum authority of the PCM to control the short-term FT allows a range between -11 percent and +20 percent. The PCM monitors the fuel trim during various operating conditions before determining the status of the fuel trim diagnostic. The fuel trim cells that are used in order to determine the fuel trim are as follows:

VIN K

* Idle, purge commanded
* Deceleration, purge commanded
* Normal driving, purge commanded
* Normal driving, no purge commanded
* Idle, no purge commanded

VIN 1

* Idle, purge commanded
* Normal driving, purge commanded
* High flow driving, purge commanded
* Normal driving, no purge commanded
* Idle, no purge commanded

You may need to operate the vehicle during all of the above conditions before the PCM determines fuel trim status. The amount that the fuel trim deviates from 0 percent in each cell and the amount that each cell is weighted directly affect whether or not the vehicle must be operated in all of the cells described above in order to complete the diagnostic.
Conditions for Running the DTC

* No VSS, TP sensor, EVAP system, HO2S, Misfire, IAT sensor, MAP sensor, Idle speed, Fuel Injectors, IC/Bypass, EGR Pintle, EGR Flow, ECT sensor CKP sensor CMP sensor, or MAF sensor DTCs are set.
* The engine coolant temperature is between 20

_________________

Which ones does the site lack?

_________________
1997 TGP

check for broken vaccum hoses, if you need help - email to bumpj5@yahoo.com

_________________
2000 Pontiac Grand Prix GT

Its a bad 02 sensor change it and call it done

_________________
Modded Like a Mother Fu**er and still gets 20+ mpg and runs 14's

Not necesarily, I had this code before and it was because a vacuum hose to the throtle body was broken

_________________
2000 Pontiac Grand Prix GT

Its not a vac hose its the 02 sensor your chasing problems by guessing go get the 02 and change it and call it done.

_________________
Modded Like a Mother Fu**er and still gets 20+ mpg and runs 14's

[html]
<TABLE WIDTH="100%" BORDER=1>
<A NAME="tab6-561061">
<A HREF="#tab6-561061">
<H4><FONT COLOR="#254164">DTC P0171 - Fuel Trim System Lean</FONT></H4></A>

<TR>
<TH ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>Step</P>
</TH><TH ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>Action</P>
</TH><TH ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>Values</P>
</TH><TH ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>Yes</P>
</TH><TH ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>No</P>
</TH></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S01"><P>1</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1><P>Did you perform the Powertrain On Board Diagnostic (OBD) System Check?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S02">Go to Step
2</A>
</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>Go to
<A HREF="/servlets/CellHandler?CellId=24968&RefDoc=561061&evc=sm">Powertrain On Board Diagnostic (OBD) System Check</A> </P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S02"><P>
<A HREF="#TD02">2</A>
</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1><P>Are any other DTCs set?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>Diagnose applicable DTCs. Go to
<A HREF="/servlets/CellHandler?CellId=25489&RefDoc=561061&evc=sm">Diagnostic Trouble Code (DTC) List/Type</A>
.</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S03">Go to Step 3</A>
</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S03"><P>3</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1>
<OL><LI TYPE="1">Start and run the vehicle in closed loop.</LI>
<LI TYPE="1">Observe Long Term FT and Short Term FT with a scan tool.</LI>
</OL>
<P>Are the values more than the specified value?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>+15%</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S05">Go to Step 5</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S04">Go to Step 4</A>

</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S04"><P>
<A HREF="#TD04">4</A>

</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1>
<OL><LI TYPE="1">Review and record the scan tool Fail Records data.</LI>
<LI TYPE="1">Use a scan tool to clear the DTC. Operate the vehicle to duplicate
the Fail Records conditions.</LI>
<LI TYPE="1">Monitor the scan tool Specific DTC info for DTC&nbsp;P0171.</LI>
<LI TYPE="1">Continue operating the vehicle until the DTC&nbsp;P0171 test
runs.</LI>
</OL>
<P>Does the DTC reset?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S05">Go to Step 5</A>
</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>Go to
Diagnostic Aids</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S05"><P>5</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1>
<OL><LI TYPE="1">Inspect the vacuum hoses for splits, for kinks, and for improper
connections. Refer to
<A HREF="/servlets/CellHandler?CellId=25351&RefDoc=561061&evc=sm">Emission Hose Routing Diagram</A>
.</LI>
<LI TYPE="1">Repair the condition as necessary.</LI>
</OL>
<P>Did you find and correct the condition?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S23">Go to Step 23</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S06">Go to Step 6</A>

</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S06"><P>6</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1>
<OL><LI TYPE="1">Inspect the crankcase ventilation valve for proper installation.
Refer to
<A HREF="/servlets/CellHandler?CellId=25561&RefDoc=561061&evc=sm">Crankcase Ventilation System Inspection</A>
.</LI>
<LI TYPE="1">Repair the condition as necessary.</LI>
</OL>
<P>Did you find and correct the condition?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S23">Go to Step 23</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S07">Go to Step 7</A>
</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S07"><P>7</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1>
<OL><LI TYPE="1">Inspect the throttle body inlet screen for damage or for the presence
of foreign objects which may alter the airflow sample through the MAF sensor.</LI>
<LI TYPE="1">Repair conditions as necessary. Refer to
<A HREF="/servlets/CellHandler?CellId=25660&RefDoc=561061&evc=sm">Throttle Body Air Inlet Screen Replacement</A>
.</LI>
</OL>
<P>Did you find and correct the condition?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S23">Go to Step 23</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S08">Go to Step 8</A>

</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S08"><P>8</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1><P>Start
the engine, and note the idle quality.</P>
<P>Is the idle high or unsteady?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S09">Go to Step 9</A>
</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S11">Go to Step 11</A>

</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S09"><P>9</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1><P>With the engine idling,
observe the Idle Air Control with a scan tool.</P>
<P>Does the value measure more than the specified value? The value is displayed
in counts.</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>5</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S11">Go to Step 11</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S10">Go to Step 10</A>
</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S10"><P>10</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1>
<OL><LI TYPE="1">Inspect the throttle body, the intake manifold, the EGR valve,
and the EGR feed pipes for vacuum leaks.</LI>
<LI TYPE="1">Repair the condition as necessary.</LI>
</OL>
<P>Did you find and correct the condition?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S23">Go to Step 23</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S11">Go to Step 11</A>

</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S11"><P>11</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1>
<OL><LI TYPE="1">Test idle air control system operation. Refer to the
<A HREF="/servlets/CellHandler?CellId=25653&RefDoc=561061&evc=sm">Idle Air Control (IAC) System Diagnosis</A>
.</LI>
<LI TYPE="1">Repair the condition as necessary.</LI>
</OL>
<P>Did you find and correct the condition?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S23">Go to Step 23</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S12">Go to Step 12</A>

</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S12"><P>12</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1><P>Test
the fuel for excessive water, for alcohol, or for other contaminants. Refer
to
<A HREF="/servlets/CellHandler?CellId=25649&RefDoc=561061&evc=sm">Alcohol/Contaminants-in-Fuel Diagnosis</A>

.</P>
<P>Did you find and correct the condition?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S23">Go to Step 23</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S13">Go to Step 13</A>

</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S13"><P>13</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1>
<OL><LI TYPE="1">Inspect the PCM injector grounds, the power grounds, and the sensor
grounds to ensure that they are clean, tight, and in their proper locations.
Refer to
<A HREF="/servlets/CellHandler?CellId=61981&RefDoc=561061&evc=sm">Ground Distribution Schematics</A>
in
Wiring Systems.</LI>
<LI TYPE="1">Repair the condition as necessary. Refer to
<A HREF="/servlets/CellHandler?CellId=61965&RefDoc=561061&evc=sm">Wiring Repairs</A>
in Wiring Systems.</LI>
</OL>
<P>Did you find and correct the condition?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S22">Go to Step 23</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S14">Go to Step 14</A>

</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S14"><P>14</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1>
<OL><LI TYPE="1">Perform the Evaporative Emissions Control (EVAP) System Check.
Refer to
<A HREF="/servlets/CellHandler?CellId=25046&RefDoc=561061&evc=sm">Evaporative Emission (EVAP) Control System Diagnosis</A>
.</LI>
<LI TYPE="1">Repair the condition as necessary.</LI>
</OL>
<P>Did you find and correct the condition?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S23">Go to Step 23</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S15">Go to Step 15</A>

</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S15"><P>15</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1>
<OL><LI TYPE="1">Perform the Fuel System Pressure Test. Refer to
<A HREF="/servlets/CellHandler?CellId=25644&RefDoc=561061&evc=sm">Fuel System Pressure Test (VIN K)</A>
or
<A HREF="/servlets/CellHandler?CellId=25645&RefDoc=561061&evc=sm">Fuel System Pressure Test (VIN 1)</A>
.</LI>
<LI TYPE="1">Repair the condition as necessary.</LI>
</OL>
<P>Did you find and correct the condition?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S23">Go to Step 23</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S16">Go to Step 16</A>

</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S16"><P>16</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1>
<OL><LI TYPE="1">Inspect the intake manifold, the injector O-rings, the EGR adapter,
the EGR valve, and the EGR feed pipes for vacuum leaks.</LI>
<LI TYPE="1">Repair the condition as necessary.</LI>
</OL>
<P>Did you find and correct the condition?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S23">Go to Step 23</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S17">Go to Step 17</A>

</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S17"><P>17</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1>
<OL><LI TYPE="1">Inspect the exhaust manifold for leaks , and for loose or missing
hardware. Refer to
<A HREF="/servlets/CellHandler?CellId=37905&RefDoc=561061&evc=sm">Exhaust System Inspection</A>
in
Exhaust Systems.</LI>
<LI TYPE="1">Repair the condition as necessary.</LI>
</OL>
<P>Did you find and correct the condition?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S23">Go to Step 23</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S18">Go to Step 18</A>

</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S18"><P>18</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1>
<OL><LI TYPE="1">Disconnect the MAF sensor electrical connector.</LI>
<LI TYPE="1">Operate the vehicle in closed loop while monitoring the Short
Term FT with a scan tool.</LI>
</OL>
<P>Does Short Term FT decrease to near the specified value?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>0%</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S21">Go to Step 21</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S19">Go to Step
19</A>
</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S19"><P>19</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1>
<OL><LI TYPE="1">Test the fuel injector operation. Refer to
<A HREF="/servlets/CellHandler?CellId=25711&RefDoc=561061&evc=sm">Fuel Injector Coil Test - Engine Coolant Temperature (ECT) Between 10-35 Degrees C (50-95 Degrees F)</A>
or
<A HREF="/servlets/CellHandler?CellId=25712&RefDoc=561061&evc=sm">Fuel Injector Coil Test - Engine Coolant Temperature (ECT) Outside 10-35 Degrees C (50-95 Degrees F)</A>
.</LI>
<LI TYPE="1">Repair the condition as necessary.</LI>
</OL>
<P>Did you find and correct the condition?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S23">Go to Step 23</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S20">Go to Step 20</A>

</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S20"><P>20</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1>
<OL><LI TYPE="1">Ensure that the HO2S is installed securely and that the HO2S pigtail
and wiring harness are not contacting the exhaust and are
not otherwise damaged.</LI>
<LI TYPE="1">Repair the condition as necessary. Refer to
<A HREF="/servlets/CellHandler?CellId=61965&RefDoc=561061&evc=sm">Wiring Repairs</A>
in Wiring Systems.</LI>
</OL>
<P>Did you find and correct the condition?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S23">Go to Step 23</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>Go to Diagnostic Aids</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S21"><P>21</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1><P>Inspect
the MAF Sensor screen for foreign objects, for debris, and for damage.</P>
<P>Did you find and correct the condition?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S23">Go to Step 23</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S22">Go to Step 22</A>

</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S22"><P>22</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1><P>Replace
the MAF sensor. Refer to
<A HREF="/servlets/CellHandler?CellId=24915&RefDoc=561061&evc=sm">Mass Air Flow (MAF) Sensor Replacement</A>
.</P>
<P>Did you complete the replacement?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S22">Go to Step 23</A>

</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>--</P>
</TD></TR>
<TR>
<TD ALIGN="center" VALIGN="middle" ROWSPAN=1><A NAME="S23"><P>23</P>
</A></TD><TD ALIGN="left" VALIGN="top" ROWSPAN=1>
<OL><LI TYPE="1"> Use a scan tool in order to clear the DTCs.</LI>
<LI TYPE="1">Operate the vehicle within the Conditions for Running the DTC
as specified in the supporting text.</LI>
</OL>
<P>Does the DTC reset?</P>
</TD><TD ALIGN="center" VALIGN="middle" ROWSPAN=1><P>--</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>
<A HREF="#S02">Go to Step 2</A>
</P>
</TD><TD ALIGN="center" VALIGN="bottom" ROWSPAN=1><P>System
OK</P>
</TD></TR>
</TABLE>
[/html]

I had this code show up on my 97 GTP, it ended up being a leak in the EGR tubing that runs from the EGR valve to the LIM.

_________________
Under Construction

What are your fuel trims?

_________________
Six-speed top-swapped GT, sold.
2006 F-150 4x4 for a daily driver.

the scanner that parts stores use dont tell u whats bad they tell u where the system is finding the problem. take a can of throttle body cleaner and spray your vacuum lines. if the engine begins to race then u have a leak. spray around ur intake too u may have a leak there as well.