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In situations where multiple mysterious faults are flagged up intermittently, the culprit has often proved to be a chaffed wiring harness.
 

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devilmaycare good point! Always worth checking the wiring harness that runs across the top of the engine on these cars and especially where it passes over the ac pipes
 

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It's puzzling as to why codes are being flagged which bear no relevance to the CRD. Maybe the ECU is generic to many different models and contains a large latent database which covers all these models and random cabling and/or grounding faults are producing unexpected and unneccessary warnings. It might even be a faulty ECU.
 
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