U0293 Diagnostic Trouble Code

U0293 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 U0293 diagnostic trouble code may include:

Faulty or damaged wiring
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Poor fuel economy
Reduction in engine performance, especially at low RPM levels

Possible Causes :

Defective ECU strategies or components will prevent proper regeneration
The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

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. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications. 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 U0293 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 U0293.

Fortunately, U0293 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0293 Trouble Code For Specific Cars

U0293 Peugeot 406 EIC Switch-1 Assembly Circuit Failure
U0293 Eshelman Sport Car Injection Pump Fuel Metering Control "B" Malfunction (Cam/Rotor/Injector)
U0293 Hindustan Motors Trekker Pedal Correlation PDS1 and LPDS High
U0293 Holden Monaro Power Supply #2 Circuit Short to Ground
U0293 Honda Fuya PRNDL Reverse Input Short To Battery
U0293 Gaz Tschaika O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
U0293 Triumph Triple Speed Pedal Correlation PDS2 and LPDS Low