What is the P0042 fault number? What is the malfunction description for the HO2S Heating Control Circuit (Bank 1 Sensor 3)? How do I fix P0042 fault code What are the causes and symptoms of the P0042 error code?
What is the P0042 Fault code? What does it stand for?
When the powertrain control module (PCM), detects an issue with the heater circuit of third oxygen sensor, the code P0042 will be stored. “Bank 1”, is the side of engine with cylinder 1.
The heated oxygen sensors are located in the exhaust pipe before and after any catalytic converters. The oxygen sensors give information to the fuel system that allows it to maintain the correct ratio of air and fuel. The PCM monitors the efficiency of the catalytic conversion by monitoring oxygen levels downstream.
The oxygen sensor measures the oxygen in exhaust gases from an engine. The oxygen sensor must be maintained at a temperature that is consistent with its intended purpose. The heater element of an oxygen sensor is here to help. When the PCM detects an issue with the heater wire within the sensor, code P0042 will be triggered.
What is the P0042 Fault Code and Why Does It Happen?
P0042 can be used to trigger multiple triggers. These are the most popular:
- – Defective oxygen sensor (Bank 1 Sensor 3)
- – The oxygen sensor heater control circuit is not working properly (for example, damaged wiring and loose connections).
- – The oxygen sensor circuit can be either short or open.
- – If applicable, blown O2 sensor heater circuit fuse
- – Defective PCM (rarely)
What are the symptoms for P0042 fault code?
Other relevant fault codes can also be stored depending on the severity. The P0042 is very similar to P0043 and P0044 codes.
- – Continuous illumination, flashing or continuous flashing of check engine light
- – Increased fuel consumption
How do I fix the P0042 fault code?
- Codes must be cleared first, and then road tested to verify if they return.
- – Repair of circuit wiring for oxygen sensor heaters and other loose connections
- – Repairing short circuits and open circuits in cables leading to the oxygen sensor
- – Replace the fuse on the oxygen sensor heater circuit
- – Replacing an oxygen sensor that is not working (Bank 1 Sensor 3).
- – Replacing PCM
How Serious Is the P0042 Fault Coding?
While the severity of P0042 is not severe, inaccurate readings can lead to increased fuel consumption. It is important to correct the problem promptly and make sure that the wound doesn’t continue to bleed.
