hard to replace rear o2 sensor?
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hard to replace rear o2 sensor?
My check engine light is on for the driver's side rear sensor. Is it hard to replace and get at the rear post-cat o2 sensors, I know the front o2 sensors are easy to get at and there are directions on 12v.org. My mechanic wants to charge me $95 to change 1 rear o2 sensor.
If not too hard, anyone know how I could get at them and what it involves? Thanks
If not too hard, anyone know how I could get at them and what it involves? Thanks
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Joined: Sep 2001
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My mechanic told me he had a bitch of time replacing mine . . .
however, the rear sensors should have almost double the life as the front sensors as they get far less exposure to damaging exhaust gases. My rear sensors looked like they could go another 100,000 miles while my fronts looked like they had it.
As the rears only monitor the cat's efficiency at combining O2 with other molecules, how would the computer know whether the sensor has gone bad unless it receives no signal? Check your electrical connections to the Sensor, maybe you just suffered damage to the cable. If not, you should just replace both rear sensors. I assume that you already replaced both front sensors sometime earlier? If not, I would inspect all those connections closely.
Good luck.
As the rears only monitor the cat's efficiency at combining O2 with other molecules, how would the computer know whether the sensor has gone bad unless it receives no signal? Check your electrical connections to the Sensor, maybe you just suffered damage to the cable. If not, you should just replace both rear sensors. I assume that you already replaced both front sensors sometime earlier? If not, I would inspect all those connections closely.
Good luck.
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mechanic did diagnostic and said rear sensor needed replacement
Thanks for your response JWG. Im starting to question whether my mechanic is wrong. I'll ask him more about how exactly he diagnosed it.
My CEL first came on a few months ago because of the o2 sensor. I've been lazy and meaning to replace the sensors, I naturally assumed that it was the front ones because they are the ones to go out first as said by everyone on the forums. But when the car failed smog test last week, the mechanic said he did a full diagnosis and he found that the rear driver's side o2 sensor needed replacement.
Would a malfunctioning rear o2 sensor even cause a CEL light? I was hoping that it was the front oens because then I could just change myself and buy the Bosch 13913 sensors for $40 a piece from Autozone. Its so funny - the mechanic said the sensors will cost $220 a piece.
My CEL first came on a few months ago because of the o2 sensor. I've been lazy and meaning to replace the sensors, I naturally assumed that it was the front ones because they are the ones to go out first as said by everyone on the forums. But when the car failed smog test last week, the mechanic said he did a full diagnosis and he found that the rear driver's side o2 sensor needed replacement.
Would a malfunctioning rear o2 sensor even cause a CEL light? I was hoping that it was the front oens because then I could just change myself and buy the Bosch 13913 sensors for $40 a piece from Autozone. Its so funny - the mechanic said the sensors will cost $220 a piece.
AudiWorld Super User
Joined: Jun 2001
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that sensor is a real mother to get out....
it's right on top of the piping so it's hard to get to... not to mention that O2 sensors weld themselves in place due to the constant heating and cooling they go through.
I tried to change my own and ended up letting my mechanic do it cuz i didn't have a lift to get the car high enough off the ground to work under it.
I tried to change my own and ended up letting my mechanic do it cuz i didn't have a lift to get the car high enough off the ground to work under it.
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