Quite a few sensors will come up with a bogus figure, I think mine does the same with that sensor, not sure it actually has one............
Is the engine performance affected at all, if not then its more likely a glitch caused by a dirty contact though ensuring your using the correct oil for a DPF goes a long way, a minimum of a ACEA C3 oil is needed not a B3/B4 as some use..... ACEA C3, E6 or API CK4, CJ4 and of 5W40 at least....
Most important though what model of Grand as a WK and a WK2 are vastly different vehicles, always pays to put a year date as well.....
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2015 WK2 CRD Laredo( ZG, WG 2.7 )
Your Never Too Old To Learn Something Stupid.
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