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U3949 Engine Code Repair

Meaning of U3949 engine trouble code is a kind of network trouble code and U3949 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.

U3949 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 U3949 code is occuring now you should check U3949 repair processes.
Now don't ask yourself; What should you do with U3949 code ?
The solution is here :

U3949 Possible Solution:

U3949 Engine

Excessive air inflow can be caused by a vacuum leak, a dirty sensor or, an exhaust gas recirculation valve not closing properly. If the problem is not enough fuel, the culprit may be dirty injectors or fuel filters, a weak fuel pump or a leaky fuel pressure regulator. The lean fuel mix error may be accompanied by rough idling, engine misfires, hesitation during acceleration and overall poor engine performance.

U3949 Code Meaning :

U
OBD-II Diagnostic Network (U) Trouble Code For Engine

3
Ignition System Or Misfire

9
Engine Oil Temperature Sensor Malfunction

4
Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)

9
Clutch Position Sensor Circuit Malfunction

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate.

U3949 OBD-II Diagnostic Network (U) Trouble Code Description

U3949 engine trouble code is about Clutch Position Sensor Circuit Malfunction.

Main reason For U3949 Code

The reason of U3949 OBD-II Engine Trouble Code is Engine Oil Temperature Sensor Malfunction.

U3949 the main thing to check is to verify the operation of the VCT solenoid. You're looking for a sticking or stuck VCt solenoid valve caused by contamination. Refer to vehicle specific repair manual to perform component tests for the VCT unit.