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C3940 Engine Trouble Code

Meaning of C3940 engine trouble code is : C3940 if your catalytic convertor fails completely, you eventually won't be able to keep the car running. Your gas mileage will also be terrible, so you should try and fix it as soon as you can. Unfortunately, the average replacement cost is around $2,000 and you can't do it yourself unless you're an experienced mechanic.

C3940 Possible Solution:

C3940 Engine

Disconnected, dirty or fouled spark plugs are common causes for engines that won't start. Spark plugs typically need to be replaced every season or 25 hours of use. You should also check that the spark plug gap is set properly. If your spark plugs look good, problems with your ignition system can also preventing a spark. These can range from a faulty spark plug lead, shorted kill switch or flywheel key damage.

C3940 Code Meaning :

C 3 9 4 0
OBD-II Diagnostic Chassis (C) Trouble Code For Engine Ignition System Or Misfire Injector Circuit Malfunction - Cylinders Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector) Shift Solenoid E Performance or Stuck Off

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.

C3940 OBD-II Diagnostic Chassis (C) Trouble Code Description

C3940 engine trouble code is about Shift Solenoid E Performance or Stuck Off.

Reason For C3940 Code

The reason of C3940 OBD-II Engine Trouble Code is Injector Circuit Malfunction - Cylinders.

C3940 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.