P2A00 - P2A00 - O2 SENSOR CIRCUIT RANGE / PERFORMANCE BANK 1 SENSOR 1

POST UPDATED IN January, 2021

Description of DTC code P2A00 Generic

When the P2A00 OBDII diagnostic code is set, it means that the PCM (Powertrain Control Module) has found a voltage reading on the bank's Oxygen (O2) Sensor that is outside the range set by the manufacturer. The number 1 O2 Sensor is located before the Catalytic Converter (TWC).

The Oxygen Sensor circuit usually has an 8-ohm resistor. That voltage should match the battery voltage. Therefore, if a variation of at least 10% more or less than the above resistance occurs, this code will be illuminated next to the Check Engine light.

Symptoms of fault code P2A00 Generic

  • The Engine Malfunction Indicator (MIL) light is on.
  • Decreased fuel efficiency.
  • General loss of engine power.
  • Other diagnostic codes are stored.

Causes of OBD2 P2A00 Generic

The reasons why the P2A00 OBD2 error code is configured are the following:

Possible solutions of the DTC code P2A00 Generic

The steps to solve the issues related to the P2A00 OBDII DTC code are:

  • Check if there are any Service Bulletins available for your vehicle.
  • If there are any other established ignition failure or throttle position codes, they must be diagnosed and repaired before the P2A00.
  • Check the cables and connectors that lead to the Oxygen Sensor and verify there is no damage. Repair or replace as necessary.
  • Use a DVOM to ground the O2 Sensor and check the resistance. Replace the sensor if there are inconsistencies in the values.

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