U20D2 Diagnostic Trouble Code

U20D2 is a kind of OBD-II Diagnostic U-Network 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 U20D2 diagnostic trouble code may include:

Hesitation upon acceleration
Excessive exhaust leak
Rich or lean exhaust
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)
Some aftermarket accessories and performance modifications

Repair Processes :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.

Process Tips

Diagnostic trouble code U20D2 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 U20D2.

Fortunately, U20D2 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U20D2 Trouble Code For Specific Cars

U20D2 Fafnir 472 Injector Circuit Malfunction - Cylinder 1
U20D2 Porsche 911 Front Wiper Select Switch "W" Short to Ground
U20D2 Perodua Kancil Driver's Seat Seatback Autoglide Rearward Switch Circuit Short to Ground
U20D2 De Tomaso Pampero Hydraulic Clutch Actuator Valve Signal Fault
U20D2 Panther Solo Driver Side Airbag Fault
U20D2 Mercedes 35 Hp A/C Water Pump Detection Circuit Failure
U20D2 Skoda L Knock Sensor 1 Circuit Input Intermittent (Bank 1 or Single Sensor)