My 2001 es protege felt as thou it would not run and would hardly go with the gas pedal fully depressed. Limped it off the road and after a few mimutes it ran ok. with check engine light is on. the dealre replaced the fuel pump becaues the sock or screen was getting clogged. the next day the light went and the dealer said it is code PO421and that the front cat converter needs replaced. I did not replace it. Four days later while driving on the turnpike at 65mpr the car felt as thou it hesiatied and the check enginr light began flashing. What should I do?
Code p 0421 refers to warm up cat converter , bank 1 --efficiency below threshold ====causes --cat converter---wiring---HO2S ( heated oxygen sensor ( ==the unit in the exhaust manifold before the cat converter)
as cat converts fail and can block the exhaust system I would advise finding an accredited exhaust shop and having it replaced
after that if the light comes back replace the HO2S sensor
SOURCE: 2002 mazda protege 5
I had the same problem with my 02 Protege 5. After new plugs, wires and a few hours of tinkering around, we found it to be a grounding problem with 1 of the coil packs. There are 2 coil packs on the motor. You can pick one up at Autozone for $30 and they very simple to change out! Good luck!
SOURCE: Check engine light came on
THERE IS A VALVE ON THE RIGHT SIDE OF THE INTAKE MANIFOLD THAT OPEN THE RUNNER.IT HAS A VACUUM LINE TO IT.FOR IT TO BE STUCK OPEN EITHER THE SOLENOID IS BAD,THE VACUUM LINE IS BAD OR THE RUNNER IS GUMMED UP WITH CARBON AND STUCK OPEN
SOURCE: Check engine light intermittently flashing, car jerking.
If you have one of the chain auto parts stores near you, check with them by phone first but most of them offer a free scan of your computer which probably has diagnostic codes stored related to your problem.
SOURCE: HI my 94 mazda protege was running fine untill 2
Well, the first thing woulb be that its misfiring, may want to start with a complete tune-up with wires and also replace the fuel filter, it sounds like its misfiring under a load which is usualy related to bad wire or wires, so i would start there and see how it runs after that, because it runs okay when the gas is pushed slowly makes me belive its a misfire problem, also clean the throtle body good use a old toth brush and some carb cleaner, hope this helps you out, good luck.
Testimonial: "thak you JohnJhon2,turned out to be wire booth over spark plug of cylinder #1 that had become conductive on the inside.replaced entire wire & fixed it"
SOURCE: For 2003 Mazda Protege ES model 2.0L 4cyl engine;
Check the air inlet boot going from the air filter to the intake for rips or holes. If rips exist, this would allow air to bypass the filter and mass air flow sensor and will lead to a check engine light appearing. The code would read "too lean, bank 1." If this problem is allowed to continue for long periods of time, the EGR ports will have to be cleaned out and maybe even the intake.
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Oil Change light:
To reset the "CHANGE OIL" light, turn the ignition switch to the run position with the engine off. Fully depress and release the accelerator pedal three times within 5 seconds. The light will flash twice and go out.
Maintenance warning light? MIL? Check engine? Maintenance Required?
You will have to go to Auto Zone to have the code read and then fix the code problem and then clear code with code reader
Regards, Lee Davidian
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front catalytic converter was replaced and it is running good no further problems.
now the light is backON after 130 miles SHOWS code P300 ramdon misfire. Now what do I do. . IT WAS TUNED UP ,ERG VALUE CLEANED, FUEL PUMP REPLACED.FRONT CATALYTIC CONVERTER REPLACED.
I had the same random engine misfire problem. After trying several things, we finally replaced the coils, and the misfires have stopped.
Unfortunately, the idle had been rough for a while, and it is now a lot worse, but that's not related to the previous problem.
I have the same problem and it has been on going for over a year. I have had my vehicle to three mecahnics including an electrical specialist and a Mazda dealer. I have replaced cat,coils,plugs,erg valve and a multitude of diagnostics have been done through a process of elemintaion. My electrical guy thinks it is the computer. As you may know they are quite expensive and finding a used one is a challenge. If anyone ever finds out what this causing these cars to act so crazy please let me know.
I have the same problem and it has been on going for over a year. I have had my vehicle to three mecahnics including an electrical specialist and a Mazda dealer. I have replaced cat,coils,plugs,erg valve and a multitude of diagnostics have been done through a process of elemintaion. My electrical guy thinks it is the computer. As you may know they are quite expensive and finding a used one is a challenge. If anyone ever finds out what this causing these cars to act so crazy please let me know.
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