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Auto Problem - Check Engine light

F

FrankSaucedo

Member
1998 Honda Civic LX
8 Months ago I had a cracked exhaust manifold. I replaced it with one from a salvage yard.

3 weeks ago the check engine light came on. The code is P0420 Catalyst efficency below threshold - bank 1. Before I go out and purchase another exhaust manifold (no, i wont get it from a salvage yard again) is there any possibility that the sensor may be bad??? How do i check the sensor?

Thanks in Advance.
 
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