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2000 Toyota Corolla I've got a persistent problem.

Tiny
KEVOCHEF
  • MEMBER
  • 2000 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • MANUAL
  • 140,000 MILES
It all first started with engine codes p0300
p0301 and p0302 cylinders 1 and 2 misfiring,
when I got two new ones the code was only reading one cylinder misfiring so my mechanic changed it and it cleared he said when it came on again we would change the other. I moved away I still have the 2nd cylinder but now it is reading cylinder 1 and 2 again. Can the cylinder break that quick? Should I get another one and replace both? It is also saying p0420 catalyst system efficiency below threshold bank 1. Can the misfiring ciylinders cause this to come up?
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Tuesday, July 7th, 2009 AT 12:15 PM

3 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
The P0420 code is a result of the misfire. Check plugs and coils, also run a compression test.

What did you replace to clear the codes?
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Wednesday, July 8th, 2009 AT 7:38 AM
Tiny
KEVOCHEF
  • MEMBER
  • 2 POSTS
We changed one coil. And reset the light in hopes it would come back on to tell us which other coil to change.
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Wednesday, July 8th, 2009 AT 11:06 AM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Check plugs also, they may be worn out if they have never been changed.

Also make sure the tube seals are not leaking oil into plug, it will also cause a miss.
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Thursday, July 9th, 2009 AT 9:24 AM

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