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2002 Mazda Protege 5 - P0421 & P0300 OBDII CODES
HELP! I posted once before and have done everything I can think of nobody can seem to help me with problem. Trouble codes 1) P0421 - Warm up catalyst below threshold(bank 1) 2) P0300 - random/multiple cylinder misfire detected. Only happens at 70MPH. Replaced all vacuum lines . Replaced EGR...- themodefanatic
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- Replies: 30
- Forum: Protege5 Forum
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2002 Mazda Protege 5
CEL blinks right after it kicks down.- themodefanatic
- Post #4
- Forum: Protege5 Forum
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2002 Mazda Protege 5
replaced all of those to. and how do i edit the title of post. new here sorry.- themodefanatic
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- Forum: Protege5 Forum
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2002 Mazda Protege 5
2002 Mazda Protege 5 - P0421 & P0300 OBDII CODES HELP! I posted once before and have done everything I can think of nobody can seem to help me with problem. Trouble codes 1) P0421 - Warm up catalyst below threshold(bank 1) 2) P0300 - random/multiple cylinder misfire detected. Only happens at...- themodefanatic
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- Replies: 5
- Forum: Protege5 Forum
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P0421 Code
HELP. Getting this code on my 2002 protege 5,(P0421). 100,000 miles. Replaces plugs, replaces wires, both sets, whole egr valve (BRAND NEW), all vacuum hoses, O2 Sensors front and back (NEW). Erased check engine light went to smog and said FAILED because couldn't complete OBD self tests. Have...- themodefanatic
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- Replies: 8
- Forum: Protege5 Forum