on March 8, 2010, 1:51 pm, in reply to "Elderly Nissan 200sx MOT fail, Excessive CO"
Any fault codes?
I would swap sensor next, I have seen cars with O2 heater faults and found ECU will totally ignore sensor signal if it logs a fault on heater circuit
Aidan
Message Thread 
Nissan 200 SX 1.8 Turbo 1993 - MOT emission failure, excessive CO at idle - Fixed # - Steve Gittins March 8, 2010, 1:36 pm
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