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DESCRIBE ISSUE.... Car throws this code cat efficency low Replaced cat and O2 Drove 2 days and code came back Any ideas or suggestions? No scanner to monitor O2 activiy
Hey dave -
Without knowing what the pre and post cat o2 readings the PCM is seeing I can only 'guess' a likely scenario.
I would guess that the cat is getting some mixture it cannot clean up.
There is a wiring problem. Maybe a defective o2 sensor. Exhaust leak. coolant or oil entering cat. Engine ECT. Really cheap replacement cat.
Any active codes or known issues ?
My tag line is it stock, no modifications.
Maybe a fuel inj leaking.
Sorry just possibilities guessing what the PCM is dealing with is a guess.