Question about 2000 Saturn SL
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Posted on Jan 02, 2017
The P0141 indicates a problem with the oxygen
sensor heatercircuit for bank 1 sensor 2; that would be the post cat
sensor. Testing for power to the heater at the sensor plug would be a
good idea, but the usual cause for this code is a faulty heater inside
the sensor itself. Since this is a post cat oxygen sensor, that
should not cause the problems you are describing; the post cat sensors
are there to monitor catalyst efficiency.
A very low or zero front O2 sensor voltage cvan be caused by a fault in the front O2 sensor signal circuit, but is more commonly caused by a very lean condition; lean fuel mixture = low (near zero) voltage with no crosscounts.
So, I would suggest starting diagnosis by checking for anything that can cause a very lean condition. First step, would be to take a fuel pressure measurement. If fuel delivery is not correct, the engine will run very lean, hesitate, and be low on power above idle.
The next thing (after fuel delivery is verified and determined to not be causing the problem) would be to check for a faulty mass airflow sensor. If the MAF sensor signal is skewed low due to a contaminated sensor or an air leak in between the MAF and the engine, it will cause the computer to underestimate the amount of air entering the engine and it will respond by shortening injector pulsewidth to inject less fuel resulting in a very lean condition.
Hope this help (remember rated and comment this help) good luck.
Posted on Mar 18, 2010
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P0141....O2 Sensor Heater Circuit (Bank 1 Sensor 2)
P0142....O2 Sensor Circuit Malfunction (Bank 1 Sensor 3)
P0143....O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)
P0144....O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)
P0145....O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)
P0146....O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)
P0147....O2 Sensor Heater Circuit (Bank 1 Sensor 3)
P0340....Camshaft Position Sensor 'A' Circuit (Bank 1 or Single Sensor)
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