What does the code P2A03 mean?

O2 Sensor Circuit Range/Performance
OBD-II Code P2A03 is defined as a O2 Sensor Circuit Range/Performance. The purpose of the oxygen sensor is to measure the oxygen content in the exhaust gases after they leave the combustion process of the engine. This information is critical to the PCM’s ability to maintain efficient fuel economy.

How do I fix the code P2A00?

Here are some ways with the help of which you will be able to correct the OBD Code P2A00:

The oxygen sensor needs replacement.
The wires and connectors of the oxygen sensor must be inspected and replaced if damaged.
The leaky vacuum needs replacement.
There might be a problem with fuel pressure.

What does code P2A00 mean?

Diagnostic trouble code (DTC) P2A00 stands for “O2 Sensor Circuit Range/Performance (Bank 1, Sensor 1).” Note that the P2A00 code always refers to an “Air/Fuel” (A/F) sensor of some kind rather than a contemporary O2 sensor. Using this method, the A/F sensor can indicate air-fuel ratio by pumping current.

What is the function of the air fuel ratio sensor?

The air fuel ratio sensor is typically in the exhaust manifold or in the front exhaust pipe. It measures the oxygen in the exhaust and sends that information to the ECU. The ECU, based on the air-to-fuel ratio, adjusts the blend to keep it at the prime level. This level is generally 14.7:1.

What causes a P2A00 code?

Any fluctuation of greater than 10 percent (higher or lower) will result in a P2A00 code and an illuminated malfunction indicator lamp (MIL). Heater circuit voltage should be consistent with battery voltage, and any 10 percent fluctuation can result in a stored trouble code as well.

What is the air-fuel ratio sensor?

Will check engine light go off after replacing O2 sensor?

The O2 sensor is just one out of hundreds of reasons the check engine light will come on. On some engines, the check engine light will turn itself off after the sensor is replaces, however, many require the code to be manually cleared with an ODB2 scanner.