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Po420 code come on for 2000 mazda protege 1.6lx

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I would start with the free stuff check all your vaccum lines for breaks or leaks that will trick your engine computer into thinking the cat efficency is below specs. if that dosent work theres a company that makes a addive called cataclean follow the instructions it works wonders for cars that drive fine but have a cat code. if that dosent work i would personally take it to a garage and have them do a smoke test or determine weather your cat is in need of replacement.

Posted on Dec 05, 2012

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6ya6ya
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Posted on Jan 02, 2017

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motor1258
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SOURCE: DTC P0106 mazda protege. code came on, cleared

Check connections etc at MAP sensor. If all good, replace it. Erase codes & retry. How's vehicle running, idling, any black smoke out tailpipe?

Posted on May 12, 2009

polarcycle
  • 1392 Answers

SOURCE: I have a 2000 chrysler concorde that the engine light just popped on - the error codes are po302, po420, po340

P0302-cylinder #2 misfire detected
P0420- catalyst efficiency below threshold bank 1
P0340-No cam signal at PCM.
The Cam sensor most likely needs to be replaced first. Clear the codes after that and drive and see what comes back on.

Posted on May 29, 2009

  • 1 Answer

SOURCE: 2000 Mazda Miata, check engine light comes on. Code PO420

I HAVE A 2000 MAZDA MIATA AND IT IS BRINGING UP A CODE PO421, CAN YOU TELL ME WHAT THAT IS

Posted on Jun 08, 2009

AaronTech
  • 115 Answers

SOURCE: Locating oil filter on 2000 Mazda Protege

on the backside of the motor, towards the firewall. look above the drive shaft. it's about haft way up the motor.

Posted on Jun 24, 2009

  • 32 Answers

SOURCE: obd2 code p0300 on mazda protege 2002

Just had one of these with a maxima, the code is multiple random misfire, when a misfire occurs, to start is do the basics, replace the plugs, check fuel pressure, clean throttle body, and coolant is topped up. also I have seen if the O2 sensor is not working correctly is can cause a misfire, you will need a scan tool to look at what the O2 sensor is doing, o rby back probing the sensor (don't damage the O2 sensor wires). If it wires replace them as well, if it has coils they usually dont give that code if one fails, it will pinpoint that a certain coil if one fals.

Posted on Oct 02, 2009

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Locating oil filter on 2000 Mazda Protege


on the backside of the motor, towards the firewall. look above the drive shaft. it's about haft way up the motor.

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