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P21A4 Engine Trouble Code

Meaning of P21A4 engine trouble code is a kind of powertrain 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.

P21A4 Fault Symptoms :

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

If one of these reasons for P21A4 code is occuring now you should check P21A4 repair processes.
Now don't ask yourself; What should you do with P21A4 code ?
The solution is here :

P21A4 Possible Solution:

Power Steering Pressure (PSP) Switch Malfunction In Key On, Engine Off Self-Test, this DTC indicates the PSP input to the PCM is high. In Key On, Engine Running Self-Test, this DTC indicates that the PSP input did not change state. Steering wheel must be turned during Key On, Engine Running Self-Test PSP switch/shorting bar damaged SIG RTN circuit open PSP circuit open or shorted to SIGRTN PCM damaged.

P21A4 Code Meaning :

P	2	1	a	4
OBD-II Diagnostic Powertrain (P) Trouble Code For Engine	Fuel And Air Metering (Injector Circuit Malfunctions Only)	Fuel Rail/System Pressure - Too High		Timing Reference High Resolution Signal A Too Many Pulses

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.

P21A4 OBD-II Diagnostic Powertrain (P) Trouble Code Description

P21A4 engine trouble code is about Timing Reference High Resolution Signal A Too Many Pulses.

Main reason For P21A4 Code

The reason of P21A4 OBD-II Engine Trouble Code is Fuel Rail/System Pressure - Too High.

P21A4 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