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HO2S (A/F) Sensor Heater Control Circuit Low (Bank 2 Sensor 1)
symptoms
Other than the MIL light illuminating you may not notice any performance issues.
cause
A short in the O2 sensor heater circuit or the sensor itself
A faulty O2 sensor heater
Wiring or connectors are broken or frayed to the sensor or relay
Bad PCM or ECM
The fix
Correct wiring short or loose connector found in inspection.
and/or
Replace the bank 2 sensor 1, O2 sensor
Replace PCM if circuit has failed and no wiring issues present, good O2 sensor
What else can I help you with?
How do you fix it trouble code PO431 on Mazda MVP 2002?
The trouble code P0431 on a 2002 Mazda MVP indicates that the catalyst system efficiency is below the threshold for bank 2. To fix this issue, first, check for any exhaust leaks and inspect the oxygen sensors for proper functioning. If the sensors are working correctly, the catalytic converter might need replacing. Additionally, ensure that the engine is running optimally, as issues like misfires or fuel system problems can also affect catalyst performance.
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