anti-pollution fault (no loss of power)

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can anyone please give me some advice
i have an antipollution fault occur again, the last time i had this i changed the maf sensor and it went
during the next 3 months the cam belt has been replaced the crank pulley has been replaced and so has the middle and rear box
and today the damn fault reappears with no loss of power this time has anyone got any ideas on this if so all input will be gratefully appreciated
thanks

[406Iain]

What engine?
There are two o2 senors on my 1749cc petrol d9.
Only ever had one anti poluution fault on mine,It stalled while I was reversing out of my drive.I restarted it and it must have got abit too much petrol though.
It stunk of fuel (you could smell it as the fumes where blowing back towards my open window) and 100 yards up the road I got the fault pop up on the screen.Never since.

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2.0 hdi 110 year 2002

[nimike]

can anyone please give me some advice
i have an antipollution fault occur again, the last time i had this i changed the maf sensor and it went
during the next 3 months the cam belt has been replaced the crank pulley has been replaced and so has the middle and rear box
and today the damn fault reappears with no loss of power this time has anyone got any ideas on this if so all input will be gratefully appreciated
thanks

when there is loss of power, it isnt usually attributed to this error (coils, air flow meter etc) according to peugeot mechanics. I have been told that replacing all sorts of sensors including the water temperature, will/can clear this problem but Im happy enough to drive away.

My petrol 406 has it on/off all the time, with no loss of power and I just drive away.

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had the car tested throttle position 2 came up also air mas
reset it and now the problem has gone
i have seen this before, i have been advised to get an ecu scanner to save myself being charged £40 each time to find or reset a fault but dont kow if my car is OBD2 compliant
can anyone advise on this
406 HDi
2.0 (110)
2002

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found the answer
vacuum and breather pipes perished at connections trimmed the pipes and m i l light went out

[Doggy]

Well done that man!

FWIW mine is now doing this on a more-or-less weekly basis
Goes into limp mode most times, next 3/4 trips it drives OK with MIL light & ANTI POLLUTION FAULT message on startup, then it just clears as I drive.

Like you, I'd love to have something to read the codes, but the general view is you need the dealer diagnostic setup which will set you back at least as much as the car.

(Dearly love to be proven wrong on the last point folks)!