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P0133 - upstream heated O2 sensor circuit slow response ( Bank 1 )
Bank 1 is the passenger side of your engine
Sensor 1 - is in your exhaust pipe before the exhaust enters the catalytic converter ( upstream )
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On a 2002 Mercury Mountaineer ( V6 and V8 engines ) Bank 2 is the drivers side of the engine Sensor 1 would be close to the engine BEFORE the exhaust enters the catalytic converter
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