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B3921 Engine Trouble Code

Meaning of B3921 engine trouble code is a kind of body trouble code and theoretically you can drive for a few weeks or even months with a broken MAF sensor. You will notice a decrease in gas mileage and over time the car will eventually start stalling a lot. At a shop, the replacement cost is between $240-$400 depending on the car, but that's usually the cost of parts because the labor is relatively simple.

B3921 Fault Symptoms :

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

If one of these reasons for B3921 code is occuring now you should check B3921 repair processes.
Now don't ask yourself; What should you do with B3921 code ?
The solution is here :

B3921 Possible Solution:

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.

B3921 Code Meaning :

B	3	9	2	1
OBD-II Diagnostic Body (B) Trouble Code For Engine	Ignition System Or Misfire	Injector Circuit Malfunction - Cylinders	Turbocharger Boost Sensor A Circuit Low	Crankshaft Position Sensor A Circuit Low Input

The poor running symptoms are consistent with a MAP sensor malfunction. In addition, in some cases, a bad MAP sensor will not throw a code. Again, the ELD code likely represents a separate wiring issue.

B3921 OBD-II Diagnostic Body (B) Trouble Code Description

B3921 engine trouble code is about Crankshaft Position Sensor A Circuit Low Input.

Main reason For B3921 Code

The reason of B3921 OBD-II Engine Trouble Code is Injector Circuit Malfunction - Cylinders.

B3921 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.

	Example: 0140