Which catalytic converter do I need?
2002 honda civic ex 1.7 is throwing a p0420. It would seem likely that its a fried cat due to driving it for some period of time with a cylinder not firing. Im looking at oem replacements and im finding two different kinds... An exhaust manifold with a built in cat, and the bent pipe kind. Which do i need? Or do i need both?
- notLv 71 month ago
The cat in the manifold is the one being monitored and is setting that code. Notice the oxygen sensors are before and after that cat; the input and output are measured and compared by the computer to set that code. The other cat has no sensor after it so it can't be monitored.
There is a chance that both cats are damaged from misfiring. There is a strong chance the first cat's reactor came apart and is clogging up the second cat. A backpressure test to check for restriction or visual inspection will be needed to determine the condition of the second cat.
- KayleenRLv 71 month ago
Hmm never tried fried cat, give me porterhouse steak any day
- JayLv 61 month ago
just go look at it