Does Check Enginelight Reset After Repairs Made

Question

Q: is it normal for an engine light that's been reset after service to come back on?

after replacing an oxygen sensor-upstream- by your company mechanic on my car and he reset my engine calorie-free code. information technology stayed off when i drove home, merely when i started the car up this morning, the engine light came back on and has stayed on. is this normal?

My motorcar has 169000 miles.
My car has an automatic transmission.

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Answer 1

Any given diagnostic trouble lawmaking will typically have multiple faults listed equally potential causes of "the" lawmaking setting. It is possible for one fault (in your example an oxygen sensor that might non be putting out the expected waveform) to be addressed in a repair and yet additional faults exist where, once again, the "additional" faults are related to the original code that was downloaded. However, information technology is also possible that the check engine calorie-free (CEL) has come on for a new reason (a new fault) that is completely unrelated to the lawmaking that involved the oxygen sensor. There are literally thousands of diagnostic trouble codes on modern vehicles, representing countless vehicle functions, that could cause the check engine light to come on. The merely style to determine whether the CEL is before long illuminated because of a new or the "one-time" code is to have the codes read once again. To do that, delight asking a cheque engine lite diagnostic and, in the context of that you could asking that the original mechanic come dorsum as he volition of course exist most familiar with all of the circumstances. If yous have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to assist you lot.