No power

Car Mechanics (UK) - - Diagnostics Doctor -

The ‘Ser­vice ve­hi­cle soon’ mes­sage is show­ing on my 2014 Vaux­hall In­signia 2.0 CDTI ECOFLEX 163 au­to­matic. The EGR valve has been re­placed, but the mes­sage is still ap­pear­ing. When it does, I lose power and there’s no ac­cel­er­a­tion when I put my foot down. Pe­ter Mul­laney

I am as­sum­ing that the ve­hi­cle ser­vice sched­ule is up to date and oil changes have been per­formed as re­quired and that the ser­vice in­di­ca­tor has been re­set. If this is the case, the prob­lem could be any num­ber of pow­er­train-re­lated is­sues. The best course of ac­tion would be to read the fault codes to get a more ac­cu­rate pic­ture of the prob­lem.

One of the more likely causes is a split or crack in one of the in­duc­tion hoses to or from the turbo or in­ter­cooler. This would give the symp­toms you de­scribe and can be dif­fi­cult to trace. Check the pipes care­fully and look for any sign of oil seep­ing out.

An­other pos­si­bil­ity is that the mass air flow (MAF) sen­sor is faulty. Clean­ing it with ei­ther a ded­i­cated clean­ing spray or iso­propyl al­co­hol may help, but do not touch the hot wire el­e­ment of the sen­sor and en­sure it is fully dry be­fore at­tempt­ing to start the en­gine.

There is also the pos­si­bil­ity that the prob­lem is oc­cur­ring due to a blocked diesel par­tic­u­late fil­ter. This may need a forced re­gen­er­a­tion, but if the codes are read it should clar­ify the sit­u­a­tion.

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