I am getting a P0031, P1512, & P0421 code

W age of car..hard startn cud be a tuneup issue..bad dist cap..plug wires..fuel pressure reg or pump..git a data stream run w a factory scan tool....at a private shop only...for correctness n detail

Idle Charge Actuator Mechanical malfunction. May have a bad O2 sensor or actuator.

The code involves IMRC runner valves in the intake manifold. I would do some internet research for the code and see if the repairs are within your abilities.

Hi

Please check the link to get a detailed idea about the code:-

http://www.obd-codes.com/p0421

Please get back to us if you have further query else please accept the suggestion.
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could anyone please help me with this problem that i have with my 2001 mazda protege es 2.0. i have a bad catalyst converter and im waiting for the converter to come in, but before the guys that are fixing on my car relize that i need a converter they put a egr valve and a o2 senor and when the car idle some time it will just die one me. could someone tell me what is going on.

After extensive searching and trial and error I found that the cause for the code 1518 on my mazda mpv was caused by the plastic clip that holds the linkage for the intake manifold runner had broke on the fire wall side and the linkage fell out causing the runner to stay open. It is very difficult to see. It is on the front( drivers side) of the engine below the upper intake manifold. Remove the air cleaner box and use a mirror and you can see it. Only about 6 inches long. Replace both clips while you are in there because it is a bear to get to. Check this first before you go through the other items like the egr. Inexpensive repair and my code 1518 and the one for randon miss fire went away never to return. Lots of power again. Good luck. Jim

my 2001 mazda 626 V-6 have a error code p0421 & P0421 so how do i fix it. tell me the causes and the solution

replace the air flow meter has this sounds like your problem.Good luck.

You own a mini van. These creations were designed by engineers to drive mechanics crazy! :-( Everything is designed with little or no access. The alternator on your van is made of aluminum (so it's silver). It is located near the crankshaft harmonic balancer. If you look at the harmonic balancer, the alternator will be at the 10 o'clock position. It is on the passenger side of the engine, behind the engine block. One of the fan belts goes to it. The pulley on the alternator has a belt on it. Follow the fan belt which goes towards the rear of the engine.
Charlie
PS You may have to get under the van to remove it.

I had the same problem and it happened at high speed on an Interstate Mountain (Hwy 5 from Kelowna to Meritt).... so scared but car ran fine all the way.... so hope it goes away.... I had the check engine light removed and hope it does not reappear