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Got the Mot done - PASS, no work required at all. THANKYOU again gentlemen!

Here's hoping! Thanks for the education gentlemen! Thought I was wasting my time with the throttle body swap - until I saw what the O2 sensors were doing afterwards. It'll be a while before I get a chance to take it in for retest, but I'll report back on the result

Hello again Frank. All figures here were with the car parked. Maybe why my readings are so different to yours? I checked the coolant temperature sensor at the start of this exercise and found nothing wrong with it - reading the right resistance at hot and cold. As it is, after I swapped the...

THANKYOU gentlemen! This is good stuff - think I understand what I'm seeing from the O2 sensors now. Armed with the information you've provided, I think I've fixed the problem by swapping out the throttle body with MAF sensor and TPS. On the OBD scanner software I was reading the wrong...

Ta. Think I may be reading the wrong screen in OBDWiz, as it's just giving maximums, not telling me about the normal expected fluctuations on sensor 1 as per the first graph above. Will recheck tomorrow.

Thanks Frank. Not sure what to make of all this though! Guess I need to do some Googling to work out what the voltages mean.

Nope, didn't have lights, heater fan or any other power-draining stuff. Should add that the 1000rpm idle was after sitting there at 3000rpm for a little while to get the O2 sensor voltages as per Frank's suggestion

Thanks for the figures Frank. I got the engine properly warm and looked at the voltages on ODBWiz - they don't look much like you quoted! At idle of 1000rpm (affected by testing or my fiddling?, usually idles at 600rpm) I get 0.8v and 0.9v on sensors 1 and 2 respectively. At 3000rpm standing...

Thanks for the reply. Any pointers on how to interpret the readings I get on the OBD scanner / OBDWiz software? It's just voltage readings, doesn't translate to CO percentages.

Hello all, Hoping for a bit of help here - never had to diagnose emissions problems before. The Micra is a 2001 K11 1.0 coilpack version. Had it tested at two different garages with the following results (permitted ranges in brackets) GARAGE 1 Fast idle CO - 0.06 (0.20) PASS Fast idle HC - 20...