P0141
P0141 - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 2
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Possible causes
- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Rear Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Rear Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks
Tech notes
Replacing the rear O2 Sensor bank 1 usually takes care of the problem.
When is the code detected?
Current amperage in the rear heated oxygen sensor heater circuit is out of the normal range.
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- High Fuel Consumption
- Excessive Smoke from Exhaust
- High Fuel Consumption
- Excessive Smoke from Exhaust
P0141 Description
The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.
P0141 Information for specific makes
P0141 ACURA
P0141 HONDA
P0141 BMW
P0141 CHRYSLER
P0141 JEEP
P0141 DODGE
P0141 FORD
P0141 HYUNDAI
P0141 ISUZU
P0141 KIA
P0141 LEXUS
P0141 TOYOTA
P0141 SCION
P0141 MAZDA
P0141 MITSUBISHI
P0141 VOLKSWAGEN
P0141 AUDI
P0141 SATURN
P0141 NISSAN
P0141 INFINITI
P0141 HONDA
P0141 BMW
P0141 CHRYSLER
P0141 JEEP
P0141 DODGE
P0141 FORD
P0141 HYUNDAI
P0141 ISUZU
P0141 KIA
P0141 LEXUS
P0141 TOYOTA
P0141 SCION
P0141 MAZDA
P0141 MITSUBISHI
P0141 VOLKSWAGEN
P0141 AUDI
P0141 SATURN
P0141 NISSAN
P0141 INFINITI
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