Oxygen sensor code: Is this the wiring or the ECU?

jtherrien
Wed, 01 Apr 2015 22:06:55 +0000
Maintenance/Repairs

Hello. I recently had my Hyundai Entourage (2008) come up with the following engine codes: P0057 and P0037, both related to the downstream oxygen sensors. The generic description of the code is heated oxygen sensor heater control circuit low. As I understand this code, it is signaling that there is too much current passing through the heater circuit. The oxygen sensors test out OK for resistance, around 10 Ohms each and disconnecting them entirely and rerunning the test after driving a few times yields the same code. So I suspect the issue is not with the sensors but either the wiring or the ECU. I’d be a little surprised at a sudden short in the wires for both sensors but I suppose stranger things have happened. Oh and the fuse for the oxygen sensors has not blown. I am correct in reading these codes to mean there is an apparent short? Or are there any other things that could cause this to happen?

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