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Leroy

Leroy 4/7/2010

2001 Mitsubishi Eclipse GT 6 Cyl 3.00L

Engine

Tbl code 0421 warm up catalyst below threshold

1 Answer


HouseCallAuto

HouseCallAuto 4/7/2010

I have never seen this fixed with anything other than replacing the cats that are attached closest to the engine. The code is just for one of them but it would not be smart to change just the one. Change both. The cat at the middle of the car underneath does not get replaced.

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