Home Vehicle Repair P0051 Malfunction code – HO2S Heater Control Circuit Low (Bank 2)

Vehicle Repair

P0051 Malfunction code – HO2S Heater Control Circuit Low (Bank 2)

What is P0051 fault code and what does it mean? What is the description of the malfunction in the HO2S Heater Controller Circuit Low (Bank 2, Sensor 1)? How do you fix the P0051 fault code What are the symptoms and causes for the P0051 fault code

What is the P0051 fault code? What does it stand for?

When the powertrain control module, PCM detects an issue with the second row oxygen sensor heater circuit of engine, a code P0051 will be triggered. “Bank 2”, which refers to an engine block in the opposite row, but not including the engine’s #1 Cylinder, is the bank. “Sensor 1” refers to upstream sensor which precedes the catalytic convert.

Oxygen sensors detect oxygen in the exhaust, and send this information to the PCM. This information is used to adjust the engine’s exact air-fuel mixture, fuel supply, and ignition timing. In order to accurately measure oxygen sensors, they must reach an operating temperature. A heating element is added to these oxygen sensors. The PCM stores fault code P0051 if it detects that the resistance to the heater circuit is less than normal (below 0.8% A).

Other related fault codes may also be possible depending on the severity. Code P0051 is similar to trouble codes P0031 and P0032.

What is the P0051 Fault Code and Why Does It Happen?

– Defective oxygen sensor (Bank 2 Sensor 1)
– Problems with oxygen sensor heater circuit
– Cables that are damaged or missing connectors
– The heater circuit has a blown fuse
– Defective PCM

What are the symptoms of the P0051 Fault Code?

– Illumination for the check engine light
– Excessive fuel consumption
Low engine performance

How do I fix the P0051 fault code?

– Replacing a faulty oxygen sensor (Bank 2 Sens 1)
– Repairing damaged cables and replacing connectors
Repair of shorted or open cables
– Replacing a heater circuit fuse
– Replacing PCM

Notice: A fuse that has blown must have a reason. Short circuits are the most common reason for a fuse to blow. After wiring is repaired, the fuse needs to be replaced.

How serious is the P0051 Fault code?

Although the symptoms of code P0051 are manageable, it is important to fix the problem as soon as possible. It is important to take care of your vehicle if it is having problems.