Logo

U3993 Engine Code Repair

Meaning of U3993 engine trouble code is a kind of network trouble code and when your car's 'U3993 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.

U3993 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 U3993 code is occuring now you should check U3993 repair processes.
Now don't ask yourself; What should you do with U3993 code ?
The solution is here :

U3993 Possible Solution:

U3993 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.

U3993 Code Meaning :

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

3
Ignition System Or Misfire

9
Engine Oil Temperature Sensor Malfunction

9
Ignition/Distributor Engine Speed Input Circuit Malfunction

3
Glow Plug/Heater Circuit 'A' Malfunction

The oxygen (02) sensors on your car measure the oxygen in the exhaust to determine how rich or lean the ratio of fuel and air are in the cylinders. Optimizing this mixture means better fuel economy and fewer exhaust emissions.

U3993 OBD-II Diagnostic Network (U) Trouble Code Description

U3993 engine trouble code is about Glow Plug/Heater Circuit 'A' Malfunction.

Main reason For U3993 Code

The reason of U3993 OBD-II Engine Trouble Code is Engine Oil Temperature Sensor Malfunction.

U3993 DTCs may also be triggered by faults earlier down the line. For example, a dirty MAF sensor might be causing the car to overcompensate in its fuel-trim adjustments. As a result, oxygen sensors are likely to report fuel mixture problems.