Evening friends. Got the old "help me dad" call again. Daughter's '99 GP service engine light came on. Had Lucilles Transmission check the codes and appears to need the O2 sensor at the cat converter replaced. Got a price for an AC Delco at $70.00. Am I facing an easy or difficult task to replace this little bugger?

Thanks,
Walt

itll most likely require impact tools; but other than that, not too bad. just make sure its not a bad cat and not the sensor, dont shoot the messenger theory.

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"Dude!, theres enough plastic bags in here to suffocate a nursery!"

Well if you live in a state that doesn't require echeck where you live, then say heck with it if it's just a fault sensor since it is only there to tell you if the cat is bad or not, but if it's the cat that's bad or clogged, then you can just take it off (again if echeck isn't required) or replace it, since the o2 sensor itself still might be fine. Did you actually write down the code number by chance? This is must my .02 and since I'm a broke college student, I like free/cheap fixes, but again if emissions test are required then my plan of attack wouldn't exactly work, but I would the cat first just so if you do replace the rear o2 sensor that the problem doesnt pop back up again.

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Dubs:00 VW GTI VR6, Low and Slow; 91 VW GTI 8v, Restoration Project; 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's; Ex-Girlfriend's 97 GP GT, "Project Pink Power"

Thanks guys. What you say makes sense. There doesn't seem to be any problem with the performance of the engine. Will definitely check if cat is bad or not. No sense in throwing money in the wrong direction. I didn't know that was the purpose of the rear O2 sensor. Appreciate the input.

Not a problem. Keep us posted on what you find out.

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Dubs:00 VW GTI VR6, Low and Slow; 91 VW GTI 8v, Restoration Project; 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's; Ex-Girlfriend's 97 GP GT, "Project Pink Power"

Easy fix believe me you would know if the cat it bad. Your car wouldn't go over about 35 mph and there would be a very noticable buring smell coming from your exhaust. It is an easy fix when I replace mine I just used an adjustable wrench and twisted it out (or you could use a 13/16 wrench). Impact tools won't work due to the fact that the sensor has a wire coming off it.

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I needed an impact on mine. Wouldn't budge with a breaker bar or nothing... Wire coming off the end.... if it's bad.. cut the wire.

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Just go to your local auto parts store and ask for a Lambda Socket set. It has a slit in it for the wire, but as Casper said, if the sensor is toast, just cut it and go crazy with an impact wrench.

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Dubs:00 VW GTI VR6, Low and Slow; 91 VW GTI 8v, Restoration Project; 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's; Ex-Girlfriend's 97 GP GT, "Project Pink Power"

i used a 1" drive braker bar on mine lol it was a stubborn SOB thats for sure. i was glad my car was from the land of warmth and sunshine (arizona)

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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

PB Blaster will become your friend if it's not already.

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Dubs:00 VW GTI VR6, Low and Slow; 91 VW GTI 8v, Restoration Project; 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's; Ex-Girlfriend's 97 GP GT, "Project Pink Power"

Better late than never. Appreciate the responses. After several suggested attempts, I cut the wire, placed a box wrench over the sensor and used a torch to carefully heat the area of the manifold that houses the sensor threads and within 20-30 seconds it expanded the manifold enough to easily remove the sensor. I was able to do this as there is nothing in the area that heat would cause damage.
Walt