Emissons light/2000 Ford Focus?
Hi. My emissions light just came on in my car. Just got the o2 sensor replaced but I also read that it could be catalytic converter? Which is very loud on the car. Wondering if that's what it is or what else it could possibly be.
If you are in the US and not in California you can take the car to most chain auto parts stores to have the codes read. We can do a lot with the codes and almost nothing without them. Be careful - when codes mention parts it is rare for those parts to be responsible; more often they are just bystanders or victims of the root cause.
I will offer one Scientific Wild A** Guess, though. If the code says P0171 (System Too Lean [Bank 1]) and the idle is misbehaving the PCV hose may be torn at the intake manifold. It can be felt on the outside of the bend in the hose there, nearly against the firewall and barely in reach from the top. It is a common fault in that era Focus.
It could be one of several hundred different things. That's why you ALWAYS start a diagnosis by checking the trouble codes stored in the computer. Asking us to guess which of the 3,000 different codes is the one that set off your light is a complete waste of time.
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