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My Astra g 1998 1.4 petrol fail on emissions , the nct/ mot man advised me that hes pretty sure its not the Catalytic convertor as the emissions come in and out and said most of the time this would be Lamda Sensor , first time i have ever got advice from nct staff, usually just say it fail and tell you what on, but i think he maybe right was getting a intermittent fault code p0170 02 sensor open circuit, Car is running well, was driver for 45 minutes hard run before test, oil change in July, spark plug change last year, air filter 2 yrs old, car was over a pit last week no leaks in exhaust, i will change the Lamda sensor as recommended by nct guy ( but Lamda was a pass?) as this was throwing a code anyway, and run it in again, any second opinions on this, thanks
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