Hey guys, I recently got an SES light and the code I pulled said there was an O2 heater malfunction. First of all will replacing the O2 sensor fix this and if so how do I go about doing it? Second I called the dealership and they said they would replace both O2 sensors before the cat for around $500. This seems a bit expensive to me, please help and let me know what you'll think I should do.

 

I am not 100% sure, but replacing the O2 should fix the preheater issue as the preheater is part of the O2.

I replaced both rear bank O2's myself and it was pretty easy. Most of my time was going out and getting a proper 22MM open ended wrench to get at the O2 in the bend of the front bank Y pipe. You HAVE to make sure the pipe is ICE cold, like not driven in a LONG time (I left mine sit 24 hours). You will risk stripping the pipe threads if you do. Also dont forget to get anti-seaze grease and get the threads before replacing the sensor. Total time was about 1.5 hours or so.

Dealer wants 500 because they want 3 hours labor for two O2 replacements (thats what they quoted me ) and about 150 an O2. You can get the O2 from DaveB for about 108.

Since you did not give us a code, or which O2 went out...this is the best info I can give you....

Good Luck!

 

The code I got was a P0135, and that is the bank 1 sensor 1 if I am not mistaken. I also called Firestone today and they said they would replace both front O2 sensors for $330. Should I replace them myself and save some trouble and time or should i take it in?

 

Depends on how much of a DYI you are. I was "told" that its possible to strip the retaining nut (the nut the O2 screws into that is welded into Y pipe. Personally, I would NOT pay all that labor for what is literally a unscrew and screw back in type of job. I gambled, and had zero problems...but we know all jobs are not like that.

 

i have a schematic of the main portion of the exhaust system depicting all the O2 sensor locations if someone wants to host it. I received from the nissan sales department in a fax.

 

 

dont replace any of them have the dealer reprogram the ECM per the TSB, that should take care of your problem and cost no more than $100.

 

I've heard that O2 sensors need to be replaced within 60k-80k miles. If this is the case I'd rather do that, but just checking with all the pros out here to make sure.

 

Hey, I can't see the pic you have, yahoo won't let me. Any chance you can email it to me? Thanks!
nadeemp8@hotmail.com