Q: Check engine

asked by on March 06, 2017

The check engine sing was appeared about one month ago. My mechanic changed the oxygen sensors (both: rear and back). After some time the check engine was appeared again. The mechanic checked the codes. So he got P0037 and P0137 codes. What should I do? Why do I have these codes?

My car has 13000 miles.
My car has an automatic transmission.

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Both codes refer to the oxygen sensor that is to the rear of the catalytic converter. With regard to Code P0037, if the rear oxygen sensor is brand new, you should check the heater circuit ground (the oxygen sensor has an internal resistance heater) and the wiring harness to the sensor as well as the sensor terminal plug. Such a check includes testing for ANY voltage drops. With regard to Code P0137, check for exhaust leaks to or around the same rear sensor as such leaks could admit oxygen which causes the oxygen sensor to output too low of a signal voltage which the ECM then sees as "out of range". If there are no exhaust leaks affecting the rear sensor, this code is caused by a wiring defect. To resolve something like this, the recommended service is a check engine light diagnostic. The fault will be identified, explained to your satisfaction and the mechanic will let you know of the cost to repair. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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