The code P0141 can be set by the following, (bank 2 drivers side HO2S)
PCM
O2 sensor
O2 sensor circuit problem
Check the resistance of the HO2S12 sensor heater looking for 3-30 ohms. The heater circuit is the two White (WH) wires on the O2 itself. Also HO2S12 is the downstream O2 sensor behind the catalytic converter. If the resistance is not correct, replace the sensor and retest.
If the resistance checks OK at the sensor, check for battery voltage to the heater circuit on the Red wire in the wiring harness.
If battery voltage to the heater is present, check the White/Black (W/BK) wire between the O2 and pin 95 of the Powertrain Control Module (PCM) connector. Make sure the wire is not open or shorted to ground.
If the wiring checks OK, check the current draw of the O2 heater by grounding it with an ammeter at the PCM connector. The current draw will usually be 0.4-4.0A depending on temperature.
If the current draw checks OK, monitor the heater status on the scanner and also monitor the voltage on the W/BK wire. When the scanner shows the heater as ON, the wire should be grounded and when the heater shows to be OFF, the wire should show battery voltage. If the wire is not being grounded by the PCM, replace the PCM and retest.
The code P0141 can be set by the following, (bank 2 drivers side HO2S)
PCM
O2 sensor
O2 sensor circuit problem
Check the resistance of the HO2S12 sensor heater looking for 3-30 ohms. The heater circuit is the two White (WH) wires on the O2 itself. Also HO2S12 is the downstream O2 sensor behind the catalytic converter. If the resistance is not correct, replace the sensor and retest.
If the resistance checks OK at the sensor, check for battery voltage to the heater circuit on the Red wire in the wiring harness.
If battery voltage to the heater is present, check the White/Black (W/BK) wire between the O2 and pin 95 of the Powertrain Control Module (PCM) connector. Make sure the wire is not open or shorted to ground.
If the wiring checks OK, check the current draw of the O2 heater by grounding it with an ammeter at the PCM connector. The current draw will usually be 0.4-4.0A depending on temperature.
If the current draw checks OK, monitor the heater status on the scanner and also monitor the voltage on the W/BK wire. When the scanner shows the heater as ON, the wire should be grounded and when the heater shows to be OFF, the wire should show battery voltage. If the wire is not being grounded by the PCM, replace the PCM and retest.
HEGO bank-1 sensor-2 -heater circuit...... test the circuit to the heater side of the monitor, if good, replace the cat monitor, BUT you need to test the CAT. CONVERTOR also to see if it's working properly...this can cause it too.....if good and replacing the cat monitor did't fix it you need to seek help at your dealer/shop to save you grief and alot of money....GL
Answers & Comments
Heated O2 sensor circuit fault. (bank 1 after cat)
This could be a bad reading from an O2 sensor, or the wiring is damaged going TO the sensor.
However you will probably find that after changing the sensor - cat codes will come up.
Looks like your cat is depleted.
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The code P0141 can be set by the following, (bank 2 drivers side HO2S)
PCM
O2 sensor
O2 sensor circuit problem
Check
the resistance of the HO2S12 sensor heater looking for 3-30 ohms. The
heater circuit is the two White (WH) wires on the O2 itself. Also
HO2S12 is the downstream O2 sensor behind the catalytic converter. If
the resistance is not correct, replace the sensor and retest.
If
the resistance checks OK at the sensor, check for battery voltage to
the heater circuit on the Red wire in the wiring harness.
If battery voltage to the heater is present, check the White/Black (W/BK) wire between the O2 and pin 95 of the Powertrain Control Module (PCM) connector. Make sure the wire is not open or shorted to ground.
If the wiring checks OK, check the current draw of the O2 heater by grounding it with an ammeter at the PCM connector. The current draw will usually be 0.4-4.0A depending on temperature.
If
the current draw checks OK, monitor the heater status on the scanner
and also monitor the voltage on the W/BK wire. When the scanner shows
the heater as ON, the wire should be grounded and when the heater shows
to be OFF, the wire should show battery voltage. If the wire is not
being grounded by the PCM, replace the PCM and retest.
HEGO bank-1 sensor-2 -heater circuit...... test the circuit to the heater side of the monitor, if good, replace the cat monitor, BUT you need to test the CAT. CONVERTOR also to see if it's working properly...this can cause it too.....if good and replacing the cat monitor did't fix it you need to seek help at your dealer/shop to save you grief and alot of money....GL