U1263 Diagnostic Trouble Code

U1263 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 U1263 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
Faulty IMRC actuator/sensor

Repair Processes :

Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed. 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. 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 U1263 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 U1263.

Fortunately, U1263 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U1263 Trouble Code For Specific Cars

U1263 Nardi Blue Catalyst Damage
U1263 Austin-healey Tickford Aux Heater Blower Fan Circuit Short to Ground
U1263 Tvr Tamora Power Steering Failure
U1263 Toyota Chaser O2 Sensor Circuit Malfunction (Bank 2 Sensor 3)
U1263 Sunbeam 2-litres Malfunction Indicator Lamp (MIL) Control Circuit Malfunction
U1263 Fairthorpe Electrina Injector Circuit Malfunction - Cylinder 2
U1263 Porsche 931 Fuel Filler Door Circuit Open