P1A02 Diagnostic Trouble Code

P1A02 is a kind of OBD-II Diagnostic P-Powertrain Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a P1A02 diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.

Repair Processes :

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code P1A02 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P1A02.

Fortunately, P1A02 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1A02 Trouble Code For Specific Cars

P1A02 Ford E-150 Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem
P1A02 Volkswagen T-roc SCP (J1850) Invalid or Missing Data for Body Status Request
P1A02 Ford 021 Left Rear Turn Lamp Circuit Failure
P1A02 Fiat 1300 Knock Sensor 2 Circuit Input Intermittent (Bank 2)
P1A02 Opel Vectra B Door Handle Switch Circuit Short To Battery
P1A02 Kia Picanto Ii Seatbelt Passenger Pretensioner Circuit Resistance Low on Squib
P1A02 Opel Astra F Data Mismatch (receive data does not match what was expected)