Mine kept coming on whilst stationary in traffic or idling for a while & would stay on until reset by my mate who works at the parts desk in kings Volvo (that's where his mechanical skill ended tho, as he was unable to work the code machine).
Anyway, he says it could be oxygen sensors, dirty throttle housing or a number of things, I'd need to book it in (@ £60 per hour+ no doubt)
After checking all the elbows etc, I thought I'd try the lazy route & bung a bottle of injector cleaner turbo superspeed crap in the tank as 'endorsed' by Matt Neale, & d'you know what? It only ruddy worked.
Light went off after the 3rd tank of fuel & I'm seeing at least 2-3MPG better on average. At £14 a bottle, it's worth a go before booking your T5 in.
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