Roughly 2 months ago I got a CEL which lead me to replace the downstream 02 sensor. I'm searching my desk, but can't find the original code. I believe it related to a voltage issue.
After replacing it and clearing it, everything was fine until this afternoon when the light came back. Got the code read and it's a P0421.
After reading around, I'm not sure where this might be pointing. The text I've found is: P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1) .
This isn't pointing to the upstream, I've read some posts that this could be an indication the cat is going bad or already has.
This is a '99 LX, stock everything with about 115k on it.
Any help would be appreciated. Thanks guys.
After replacing it and clearing it, everything was fine until this afternoon when the light came back. Got the code read and it's a P0421.
After reading around, I'm not sure where this might be pointing. The text I've found is: P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1) .
This isn't pointing to the upstream, I've read some posts that this could be an indication the cat is going bad or already has.
This is a '99 LX, stock everything with about 115k on it.
Any help would be appreciated. Thanks guys.
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