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U0639 Engine Trouble Code

Meaning of U0639 engine trouble code is a kind of network trouble code and U0639 code can be about replacing a broken oxygen sensor can eventually lead to a busted catalytic convertor which can cost upwards of $2,200. Taking your car into a shop will cost you around $210 depending on the car. However, an oxygen sensor is easy to replace on many cars and is usually detailed in the owner's manual. If you know where the sensor is, you only have to unclip the old sensor and replace it with a new one. Regardless of how you approach it, you should get this fixed right away.

U0639 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 U0639 code is occuring now you should check U0639 repair processes.
Now don't ask yourself; What should you do with U0639 code ?
The solution is here :

U0639 Possible Solution:

U0639 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.

U0639 Code Meaning :

U 0 6 3 9
OBD-II Diagnostic Network (U) Trouble Code For Engine Intake Valve Control Solenoid Circuit Low Fuel Temperature Sensor B Circuit Range/Performance Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector) Reverse Input Circuit

Regarding the U0639 code, it would probably be worthwhile to carefully inspect the wire harness near the intake manifold bracket. This is done most easily from below the car in the area near the oil filter.

U0639 OBD-II Diagnostic Network (U) Trouble Code Description

U0639 engine trouble code is about Reverse Input Circuit.

Main reason For U0639 Code

The reason of U0639 OBD-II Engine Trouble Code is Fuel Temperature Sensor B Circuit Range/Performance.

U0639 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.