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P3974 Engine Trouble Code

Meaning of P3974 engine trouble code is a kind of powertrain trouble code and when the check engine light comes P3974 code on the first you should check is the gas cap. Pull over, retighten it, and take a look at the cap to see if it has any cracks in it. Continue driving and see if the check engine light turns off. Alternately, you can purchase a gas cap for about $3 at an auto parts store. All you need to do is take the old one off and screw on the new one. If you've already made it to the store, you might as well just replace it. While not car-threatening, it's good to take care of this right away to improve gas mileage.

P3974 Fault Symptoms :

Check engine light comes on
Engine stalling or misfiring
Engine performance issues
Car not starting

If one of these reasons for P3974 code is occuring now you should check P3974 repair processes.
Now don't ask yourself; What should you do with P3974 code ?
The solution is here :

P3974 Possible Solution:

The crankshaft sensor signals the fuel injection computer or the ignition control when the cylinders are firing. This causes the ignition coil to provide a spark and the injector to inject fuel into each cylinder at the right time.If either sensor isn't working correctly, the car will run rough and the engine will be less efficient. In later car models, the car's computer can usually keep the vehicle running, but the engine warning light on the dashboard goes on to warn the driver.

P3974 Code Meaning :

P	3	9	7	4
OBD-II Diagnostic Powertrain (P) Trouble Code For Engine	Ignition System Or Misfire	Injector Circuit Malfunction - Cylinders	Cylinder 10 Contribution/balance Fault	Timing Reference High Resolution Signal A Too Many Pulses

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.

P3974 OBD-II Diagnostic Powertrain (P) Trouble Code Description

P3974 engine trouble code is about Timing Reference High Resolution Signal A Too Many Pulses.

Main reason For P3974 Code

The reason of P3974 OBD-II Engine Trouble Code is Injector Circuit Malfunction - Cylinders.

P3974 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.

	Example: 0140