UK-POLOS.NET - THE VW Polo Forum

I have a misfire that I have tracked down to what I think is a problem with the supply voltage to the o2 sensor heater. The voltage varies bettween 3.8 and 12 volts, (IE, 3, then 10 then 4 then 12 ect over a few seconds) It should be 12 volts all the time? Does anyone have a wiring diagram that show...

My VW Polo (2000, 6N2, AUD) has started to misfire (Only error on VCDS shows on 2,3,4 cylinders) Gave the engine an oil change, oil filter and air filter. Changed the plugs and leads. But still has the misfire (2700-4000 rpm) from cold it is ok and till around 8 minutes later when it will misfire (w...

Ok, found the problem. Because the lambda/O2 sensor was running at below just below its correct operating voltage its giving false readings. This was because the battery is running at just below 11 volts. New battery!! No, the alternator is delivering just fewer than 11 volts regardless of load etc....

I have had my 6n2 (2000, 1.4 16v) polo for 3 years. It failed its mot this year on emissions of fast idle CO 0.76, lambda 1.036, second idle CO 0.75 and Idle CO 0.70, it passed (Only just) on HC. The CO was 10.2 before it had all the vacuum hoses replaced! It had a full engine service (oil, all filt...