Ongoing issues with O2 sensors / P0037 code
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From: Lubbock, TX
Ongoing issues with O2 sensors / P0037 code
The story so far:
I have a 2004 350Z with about 127,000 miles on it. Back in August, my service engine light switched on and I took it to the mechanic to have it checked out. The code on the car was P0037 and they determined that the bank 1 sensor 2 heater circuit was out, which they replaced. Once I picked the car up, the check engine light came on about two miles down the road. I took it back and they checked the codes, same problem. They replaced the sensor again hoping it was just a faulty part and when the car was driven again a few miles down the road it did the same thing, the check engine light came on and it was the same sensor. The mechanic then tried to run down what was going wrong and after a week or two they discovered that the powertrain control module had somehow become cracked and that this was what they thought was causing the sensor to burn up. They replaced the sensors and the board and returned the car. It's driven great for the past two months, but earlier today the check engine light came back on and I pulled the codes. Once again it is P0037.
Everything is still under warranty, but I wanted to know if anyone else had ever run into these kinds of issues before? At this point I am about 2k into repairs and staring at another week or two without a car. I searched previous threads but wasn't able to locate anything specifically about this issue. Any insight or suggestions are welcomed!
I have a 2004 350Z with about 127,000 miles on it. Back in August, my service engine light switched on and I took it to the mechanic to have it checked out. The code on the car was P0037 and they determined that the bank 1 sensor 2 heater circuit was out, which they replaced. Once I picked the car up, the check engine light came on about two miles down the road. I took it back and they checked the codes, same problem. They replaced the sensor again hoping it was just a faulty part and when the car was driven again a few miles down the road it did the same thing, the check engine light came on and it was the same sensor. The mechanic then tried to run down what was going wrong and after a week or two they discovered that the powertrain control module had somehow become cracked and that this was what they thought was causing the sensor to burn up. They replaced the sensors and the board and returned the car. It's driven great for the past two months, but earlier today the check engine light came back on and I pulled the codes. Once again it is P0037.
Everything is still under warranty, but I wanted to know if anyone else had ever run into these kinds of issues before? At this point I am about 2k into repairs and staring at another week or two without a car. I searched previous threads but wasn't able to locate anything specifically about this issue. Any insight or suggestions are welcomed!
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Joined: Nov 2017
Posts: 32
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From: San Bernardino
Check the harness cables for an open circuit or short. Many people overlook these, but it should have been ruled out before replacing any part. And be thorough, sometimes there can be a fray on the wire before the sensor or after it, or it might be a broken or loose wire crimp pin inside the connector housing.
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Joined: Feb 2009
Posts: 2,821
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From: Seattle, WA
Yes, what Caveman said. Also check the temps after the cat where the bank 1 sensor 2 bung is and the STFT readings for both banks to compare the one throwing the code (bank 1) vs. what bank 2 is putting out in closed loop. The bank 1 cat might be toast, particularly if it's never been changed out with that many miles on it.
Last edited by zakmartin; Jan 26, 2018 at 10:16 AM.
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