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Q: my check engine light came on.

asked by on

the people at autozone said that the o2 sensor is getting high voltage. what needs to be fixed?

My car has 135000 miles.
My car has an automatic transmission.

A: Hi - the &quot;high voltage&quot; remark fr...

Hi - the "high voltage" remark from your parts house person means that the O2 sensor is seeing a steady "rich" mixture coming out of the engine, and responds by generating a 1 volt signal (vs 0 volts for a lean mixture). This could be caused by a coolant sensor that is reporting a colder coolant temperature to engine management than really exists, causing the engine to run too rich. Were there any other problem codes? The O2 sensor problem code is a symptom, not the cause. I would recommend having a Check Engine Light is On completed by a mobile, professional mechanic, such as one from YourMechanic, to diagnose this problem, get an accurate assessment of damage and cost estimate for repairs.

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