P0142 Malfunction Code – O2 Sensor Circuit Malfunction (Bank 1, Sensor 3)

What is the P0142 fault number? What is O2 Sensor Circuit Malfunction Bank 1, Sensor 3? How do I fix the P0142 fault code What are the symptoms and causes for the P0142 fault code

What is the P0142 fault code? What does it signify?

The engine must have oxygen sensors in order to operate at its best efficiency and performance. O2 sensors’ primary function is to determine the level of oxygen in the exhaust. These sensors can fail as with all engine components. P0142 is one of the most common diagnostic trouble codes for a defective oxygen sensor circuit. If the O2 sensor voltage signal fails to respond for a set period of time, P0142 is triggered. The code’s description states that “Bank 1” refers to the bank that contains the engine’s number 1 cylinder. “Sensor 3,” refers the O2 sensor closest to the engine, after a catalytic convert.

To determine how much fuel to inject into the engine, the PCM uses the signal of the upstream oxygen sensors. The signal from downstream sensors, which are after the catalytic convert, is used by the PCM to determine the efficiency. In order to get a precise and smooth reading, the oxygen sensor requires a set operating temperature. O2 sensors can be equipped with a heating part to rapidly reach this operating temperature. The sensor tip, which is embedded in the exhaust pipe of the O2 sensor, doesn’t send any voltage signals until it reaches a specific temperature.

Four wires are used to heat O2 sensors. One wire supplies the voltage signal of 0.5 volts to the PCM while the other is ground. The remaining two wires supply the O2 sensor heater with ground and battery voltage.

The sensor voltage varies depending on the amount of oxygen in the exhaust. It can range from 0.1 to 0.9 Volts. If the exhaust is too lean, it will be 0.1V. A reading of 0.9V means that it has too much air. If the voltage signal is out of range or interrupted, the PCM stores fault code 0042.

There are many vehicles that can be affected by the P0142 fault code, including models from Toyota (especially Camry), Acura Jaguar, Mercedes Benz and Hyundai as well as Volvo, Ford, Ford, Ford, Mercedes Benz and Hyundai.

What causes the P0142 Fault code?

These are possible triggers for this error code:

• – Defective oxygen sensor (bank 1 sensor 3)
• – Exhaust leaks before sensor
• – Wiring problems in the O2 sensor circuit (short, or open wires touching exhaust system).
• – Defective PCM

What are the P0142 Malfunction Code Symptoms

You may experience the following symptoms if your vehicle has a code of P0142:

• – Illumination and control of the check engine light
• – Increased exhaust emissions
• If there is an exhaust gas leak, it could leak into the passenger compartment.

Because they don’t directly affect fuel delivery, but monitor the catalyst’s efficiency, post-catalyst O2 sensors are not likely to cause driveability problems.

How do I fix the P0142 fault code?

• Road tested to check if the codes are still valid.
• – Check for any exhaust leaks or damage before the O2 sensor is installed. Repair if necessary.
• – Replace or repair wiring to O2 sensor, bank 1 sensor 3.
• – O2 sensor replacement bank 1 sensor 3