POST-TRAU­MATIC STRESS

Car Mechanics (UK) - - Your Letters - Dave Blak­eney

James Cul­bert’s query about post-mot test­ing with his Nis­san NV200 Combi (‘Limp-home mode’, Di­ag­nos­tics

Doc­tor, May 2018) jogged my mem­ory. I had a sim­i­lar is­sue with my 2007 BMW E70 X5 3.0 when I col­lected it from an MOT test. Within about five miles on the A14, it lost all power and coasted to the hard shoul­der. I shut it down, but it was fine when restarted. No warn­ing lights, no codes, noth­ing.

Then, after the last MOT, it did ex­actly the same thing on the A6 near Le­ices­ter, dy­ing with­out warn­ing within five miles of pass­ing the test with no ad­vi­sories.

Thank­fully, it hasn’t re­peated the fail­ure between tests, so I can only put it down to the test pro­ce­dure. I sus­pect the ex­treme throt­tle tests car­ried out on diesels is stress­ing and up­set­ting the sys­tem, but it would be in­ter­est­ing to get a de­fin­i­tive di­ag­no­sis.

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