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How to fix heater on 2004 Toyota sienna 10000 miles with code P0051-heater contol circuit low bank 2 sensor 1?
Wiki User
∙ 18y ago
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
Wiki User
∙ 9y ago
Wiki User
∙ 18y agoThis vehicle is still under warranty. Take it to the dealer. I went to the dealer,but they said that I have to pay for everything and even for testing.
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