I have replaced the 2nd coil since my last post. computer notices and throws that P0421 code. unburnt fuel gets dumped into the Cat which ruins it and the honeycomb falls apart. From other research I did on this board and others, the problem occurs like this: engine starts to misfire for some reason. if you get mechanic to do it, you could be looking at $800-$900 bucks. You can get an aftermarket Cat for about $300. the bad one is called the Pre-Cat and it is attached to the exhaust manifold. If your car is setup like mine (and I think it is), there are two Cat's. P0421 is probably the Cat, I had to replace mine too, but it shouldn't cause the engine to misfire. When I had this issue (2001 Protege ES2.0, not a 5), it ended up being the coil packs. If you are still misfiring then you should still get P0300 or something to that effect. Many thanks in advance to anyone who can help!!! Do you have any suggestions or ideas, or anything else to try in reference to my situation. converter based on what I've read on here but have been unable to find an aftermarket part/s.
OL FAULT 2003 MAZDA 6 P0171 CODE
I stop at autoparts store and get a misfire code P0300 and P0421.ĩ/19 take it to a different mechanic, they can't find anything wrong with it and the only code they get is the P0421.ĩ/27/11 stop at autoparts store to see if I'm getting any other codes besides the P0421, nope that's the only one.
OL FAULT 2003 MAZDA 6 P0171 FREE
It wants to stall anytime I come to a slow speed/stop.ĩ/12/11 pick up car, mechanic replaced 1 coil pack free of charge, cleared out misfire code.ĩ/14/11 check engine light comes back on. This time I drive it all the way into the mechanic since I know it's a misfire. Misfire code removed.ĩ/7/11 picked up car day before, ran like a champ! In the afternoon I got in it and the idling issue was back and car had same issue where I could barely get any power and car is bucking, check engine light flashing again. Mechanic said my fuel pump was bad and a miss fire code was present so had fuel pump it replaced. As I started driving it barely had any power (I have a stick) so I drove it to a big parking lot where I knew I'd have it towed. replaced: cold air pipe, solinoid, water pump, timing belt, spark plugs, coolant.ĩ/4/11 car suddenly developed an idling problem at a stop light and check engine light came on flashing. Here's what I've had done in the last 3 weeks: I've got a Mazda 2002 Protege5 and am also getting the PO421 error code. Any suggestions would be greatly appreciated!!Īutoteck21 I saw your last post. Obviously, I think they are milking me for $$, but I'm not exactly sure what I should do about it, or what the P0421 code is telling me is really wrong. The work they want to do is (1) 4 cyl tune up - $50 (ok, maybe), (2) replace the plug wires - $136 (why? I have no problems with power loss or troubles starting it when it rains), (3) injector service - $90 (why? I only have 38,000 miles), (4) throttle place service - $80 (unlikely, but maybe).
The light came back on, I took it to the dealer, dealer pulled the same code & said that before Mazda would cover the replacement of the cat under the emissions warranty, BUT FIRST I had to have some work done to "clean" then engine since it was running "dirty", THEN if the light came back on, they would replace the cat. The first time the shop said that if it came on again, take it to the dealer due to the 8 yr emission warranty. I've had the P0421 (warm-up catalyst system below threshold) code pulled from my car twice.
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