U1440 Diagnostic Trouble Code
U1440 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 U1440 diagnostic trouble code may include:
- Cherry red hot catalytic converter
- Poor acceleration
- The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
- Reduction in engine performance, especially at low RPM levels
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Possible Causes :
- 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.
- Some aftermarket accessories and performance modifications
- An air leak forward of the DPF will change the sensor readings resulting in the code
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Repair Processes :
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.
You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.
Process Tips
Diagnostic trouble code U1440 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 U1440.
Fortunately, U1440 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.
U1440 Trouble Code For Specific Cars
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