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My 2002 mazda protege es check engine light is on reading codes po421 po300 po171 117 000 miles runs great intell this po421 code can u help

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 10 Answers

SOURCE: 2002 Madza Protege was checked

any time the check engine light flash on and off you are causing damage to the cat.

Posted on Apr 26, 2009

  • 2 Answers

SOURCE: how to adjust caliper for rear brakes on a Mazda Protege Es.

yep, this is what u do. i read that this controls hand break and you need to completely loosen that using hex (3mm) key. BUT, when u tighten it back up, u need to unscrew it about 1/8th, VERY important, or ur pads will be rubbing way too much against the rotor. I actually had to do about 1/2 the turn to make the wheel spin w/out too much pressure.

Posted on May 03, 2009

  • 5 Answers

SOURCE: Mazda Protege ES 2001,speedometer and odometer

Vehicle speed sensor. See if you can buy one of those cheap OBD2 scan tools Wal-mart sells, and if you have a P0500 in the PCM, I would place my money on a broken sensor. It costs about $60

Posted on Jul 23, 2009

  • 202 Answers

SOURCE: code po300 comes on when you drive p1133,po171

code P0300 means random cylinder misfiring, have u checked spark plugs and cables

Posted on Jul 24, 2009

  • 2 Answers

SOURCE: where is the blower motor resistor on a 2002 mazda protege?

just remove the glove box and its right behind it just take the white pug out and the two phillips screws to remove the resistor out, replace with the new one and cool off!!!! Hope this helps

Posted on Aug 04, 2009

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My 2001 Mazda Protege does not shift into third gear. The check engine and battery light is on. I've had the transmission fluid checked, a tune up and an alternator put in. What should I do?


In every case where the check engine light is on there should be a code read and/or the use of diagnostic equipment to locate the fault, repairs carried out as required and then the code cleared from the memory.

It is probable other things will start working normally when the problem causing the engine check light to illuminate has been rectified but whether this is true or not that must be your starting point.

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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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1999 Mazda Protege ES/1.8L Manual Trans


cat is probably gone if it is the stock one, but i also know the mass air flow sensor could be the problem, and its also the cheaper of the two things you could do (MAS or pre-cat). you can try cleaning it with the spray stuff they sell at any local auto store. readings online say this car running rich will kill the catalizer in two weeks so you might want to keep that in mind.

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