ive got a question. my 2009 LR3 (80k miles) is starting to drive me crazy.


a few years back, the check engine light came on with the code reading bank 1 and 2 sensor errors. I took to the dealer and they said it was a low battery and installed a new one because it was under warranty.

Well, 3.5 years later, the same light has come on and im getting the same error. Specifically, DTC Code P0137-00, Temporary - Heated exhaust gas oxygen sensor - circuit low voltage (bank 1 and bank 2, sensor 2).

I changed the battery myself. My mechanic said when i change the battery there is a reset that has to be done, so he did that and rechecked the codes. The code described above is still showing. he said go ahead and drive it 150 miles and he will re-check it again. I drove 200 miles and the code is still there.

He wanted to change the two O2 sensors ($200 a piece, plus $100 labor).

My question is, do you think it is a low battery again and i need to drive it to "reset" things or do the O2 sensors go bad enough to change at 80k? both rear ones are showing it...but its listed as temporary. once showed as intermittent.


thank you for any input! i may just take tot he dealer, but they are backed up a couple more weeks.

 

Hi. I would suggest that you check the voltage at the battery with any multi meter. Should be 11-12.5 volts or so. Then check it again when the engine is running, should be 13+. I doubt this is the problem though. o2 sensors have a heater inside of them which can go bad. At 80k miles, this doesn't surprise me. $500 seems steep for such a small job. I think you can buy aftermarket sensors and a special socket to remove them for $100 total.