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U2403 Engine Trouble Code

Meaning of U2403 engine trouble code is a kind of network trouble code and when your car's 'U2403 Check Engine' light comes on, it's usually accompanied by a sinking feeling in the pit of your stomach. The light could mean a costly problem, like a bad catalytic converter, or it could be something minor, like a loose gas cap. But in many cases, it means at minimum that you'll be visiting the car dealer to locate the malfunction and get the light turned off.

U2403 Fault Symptoms :

  1. Check engine light comes on
  2. Engine stalling or misfiring
  3. Engine performance issues
  4. Car not starting
If one of these reasons for U2403 code is occuring now you should check U2403 repair processes.
Now don't ask yourself; What should you do with U2403 code ?
The solution is here :

U2403 Possible Solution:

U2403 Engine

Gasoline engines use spark plugs to cause an explosion of fuel within the cylinder. In a properly timed engine, this explosion occurs at the proper moment to send the piston to the bottom of the cylinder and provide power to the drive shaft. If the plug wires are out of sequence, the explosion occurs at the wrong time. The improper timing of the explosion sometimes pushes the cylinder the wrong direction or interferes with the turning of the crank. As a result, the engine stutters or backfires, if it runs at all.

U2403 Code Meaning :

U 2 4 0 3
OBD-II Diagnostic Network (U) Trouble Code For Engine Fuel And Air Metering (Injector Circuit Malfunctions Only) O2 Sensor Heater Circuit Malfunction Cold Start Injector 1 Malfunction Exhaust Gas Recirculation Sensor B Circuit High

Is the fuel pump sometimes not priming when you turn the key to ON(II)? Start by measuring the fuel pressure and checking whether you have bright white-bluish spark at all four plugs. The mechanical timing is also something that you should check, as we mentioned above.

U2403 OBD-II Diagnostic Network (U) Trouble Code Description

U2403 engine trouble code is about Exhaust Gas Recirculation Sensor B Circuit High.

Main reason For U2403 Code

The reason of U2403 OBD-II Engine Trouble Code is O2 Sensor Heater Circuit Malfunction.

U2403 DTC specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set.