car md registering read error on 1996 Mitsubishi Eclipse

Bought d car with check engine light on so i bought a car diagnostic tool (car md ) test registered problem speed sensor n fuel pressure regulator but after a month check engine went out but i did not work on the problem later check engine light came out again so i test it with d car md it registered code 141 so i remove n clean d oxygen sensor downstream check engine went out then after a week test d car again w/out check engine light it reads error what do think went wrong thanks.

by in Bellerose, NY on April 22, 2011
1 answer
ANSWER by on April 22, 2011
P0141 is an Oxygen O2 Sensor Heater Circuit Malfunction (Bank1, Sensor2). Heater circuit failure is internal and can't be "cleaned". Oxygen sensors are identified by bank and sensor position. Sensor 1 is always pre catalytic converter, sensor two is always post catalytic converter. If an engine is a 4 or 6 cylinder engine the whole engine is considered bank 1, if an engine is a V6, V8, V10....., the engine bank containing cylinder number 1 (first cylinder in the firing order) is considered Bank 1, the other bank is considered Bank 2. Interpretation Oxygen sensor designation B2S1 refers to Bank 2 Sensor 1, it will be the sensor on the engine side of the catalytic converter in bank two. Check this link to determine the cylinder that contains cylinder number 1.

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