P0155 on a 2002 Infiniti Q45 - where is the oxygen sensor and what is the part number?
I recently had a check engine light on my 2002 Infiniti Q45 with 95,000 miles on it. The car has been running great and I haven't noticed a drop in fuel economy. It's also time for my emissions inspection, so I have to get this fixed before I can pass.
I whipped out my ODBII scanner and got the error code P0155. This indicates that the O2 sensor on bank 2 sensor 1 has failed. Question is, where is this sensor located and what is the part number? Rockauto.com is telling me this is the upstream right sensor, but I'd like to confirm before I buy the part. I tried looking for a manual with no luck. Thanks!
Posted Sep 30, 2018, 10:44 PM UTC
15
Here is the link to a quick Google search I did. Click the 'Images' tab for a couple of helpful diagrams:
https://www.google.ca/search?q=2002+infiniti+q45+oxygen+sensor&client=ms-android-bell-ca&source=android-browser&prmd=sivn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiAqImohuTdAhVmneAKHeaOB5cQ_AUICigC&biw=360&bih=512&dpr=3
Often, parts store can find the part number for you and can print similar diagrams
Many of those are for the QX4. I Put the Q45 in quotes and it does appear to be on the right as you sit in it, on the left as you look at it from the front. Here is the service manual: http://www.nicoclub.com/FSM/Q45/2002_Q45/2002_Q45/em.pdf EDIT:check page 22 specifically, or this image I took of it: https://i.imgur.com/XMfqCkT.jpg
These part's are usually listed from the car's perspective (as you sit in it), right?
It gives you a starting point to look for it. They are impossible to mistake for anything else. Look for something on the pipe with wires coming off of it
Hey so I replaced the part however the car wouldn't recognize the part at all. The mechanic who did it for me plunged in his fancy OBD2 with a live view, and the sensor was outputting no data at all. They then spent an additional hour checking various fuses, but it appeared the part had been installed correctly, and the car was not picking up the signal at all.
I'm thinking my next step is to call the dealership and see if there has been a service advisory/recall on this part for my make and model, and possibly just have them replace it. Any advice?
It's possible either the sensor is defective or the wiring is damaged