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P0421 Engine Diagnostic Code For Mazda Mx 5

Sample P0421 Engine

P0421 engine code for Mazda Mx 5 provides below are generic codes that may not apply to all vehicles. Mazda Mx 5 manufacturer uses specific Mazda Mx 5 diagnostic code that are different from the codes shown below. Foreign vehicles may also use DTC codes different from the generic DTC codes.

Do you have fresh, clean fuel in the tank? If it's empty, fill it up and go! If it's full, check P0421 that the fuel shut-off valve is open and that it is clean. Stale fuel, dirt and debris are the most common cause of outdoor power equipment not starting properly. If you store equipment with untreated gas in the tank, it can lead to engine damage.

P0421 Diagnostic Trouble Code For Mazda Mx 5 Meaning

P 0 4 21
Powertrain Problem SAE - Generic Auxiliary Emission Controls 21 Engine Fault Code
Mazda Mx 5 Car Engine How to fix P0421 engine diagnostic code For Mazda Mx 5 ?

Starting letter P diagnostic code shows that there are problems in engine, transmission and emissions systems.
If your "Check Engine Light" is on, it means your vehicle has one or more OBD II Trouble Codes so you have to check your engine diagnostic code tool.

If your vehicle is an older model with a non-electronic Auxiliary Emission Controls, you can check the distributor cap to see whether the spark is getting from there to the coil and on to the spark plugs.


Don't forget ! If your P0421 engine code not resolved on and there are trouble codes in your computer, your vehicle will not pass an OBD 2 emissions test. The light must be off and there must be no codes in memory to pass an OBD 2 emissions test. In addition, all of the OBD II self-monitors that check for faults must have run and completed without finding any further problems to pass the test.