Hi Aziners, I really need some help my cars check engine lights keeps reappearing even after pulling the negative battery to reset ecu... Took to autozone for quick diagnostic and results read A/F sensor malfunction code
P0134.

Been driving for a week with problem and car just does not drive the same, performance and fuel economy dropped very low, acceleration and engine studdering as well.

Any suggestions and advice would be helpful and appreciated, thanks guys!!

Oh I drive an 07 TL Type -S btw

 

I believe that's the rear upstream sensor. Just replace the 02 sensor.

 

Thanks, ill look into that, from the diagnostic results its calling it Sensor 1 but doesn't say upstream or downstream bank 1 or bank 2

 

It says bank 1 sensor one or bank 1 front sensor. That would make it the primary 02 sensor on the firewall side. If you're unsure that the 02 is your problem you can switch the primary 02s and see if it pops a code for the other bank.

 

sensor 1 = upstream
sensor 2 = downstream

that's pretty much universal for all makes and models.

 

Ordered an oem o2 sensor for the rear upstream bank, it seems theyre calling it an A/F sensor now days... Will install when it arrives and hope that fixes the problem, thanks for info guys.

 

A/F sensor is just a term most dealerships use. You would be surprised at how dealerships call their parts completely different names than what everyone outside the dealership knows them as.

 

Just installed oem sensor and car running great like before again, and check engine light hasn't reappeared, thanks again fellas !!

 

Sorry to bring this thread back to life but I'm having a similar problem. 2005 Acura TL. Pulling P0134 P0135 and P2195. Gas mileage is TERRIBLE and throttle response is terrible. I understand I may have to replace the O2 sensors but do I need to replace more than 1 as I have all of these codes? I don't believe the muffler has a leak as its not making any crazy noises. HELP! Auto zone is telling me it's $200 for the Air/Fuel O2 sensor but I want to make sure I'm not pouring $ in the wrong direction first. Thank you!

 

Also... My a/c will blow cold for a while and then starts blowing out regular air from outside. It's like it's out of freon but when I check, it doesn't have any leaks and the lines are still compressed at 60psi. Would there be any correlation with the a/c not working and the O2 sensor being bum?