#error code about o2 sensor

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Can modifying an aftermarket car header cause an engine O2 sensor check light?

Yes, modifying an aftermarket car header can cause an engine O2 sensor check light. This is because aftermarket headers are often designed to improve airflow and performance, but they can also change the exhaust gas flow. This can cause the O2 sensors to read inaccurate readings, triggering the check engine light. Why do some vehicles not have this error light issue? Some vehicles do not have…

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