williamjung25

Mercedes Viano generator issue

My Mercedes Viano, build year 2007 with a diesel engine, is causing me grief. The generator seems to have failed. I've got reduced engine power, a warning light on the speedometer, and it starts poorly when cold. The lights flicker, and the error memory has logged a fault. I suspect a defective generator. Has anyone encountered this?

A 2007 Mercedes Viano with a diesel engine is experiencing reduced engine power, a warning light, poor cold starts, flickering lights, and logged error codes, suggesting a generator issue. Possible causes include a defective generator, a weak battery, or a slipping serpentine belt. After checking the belt and considering the battery's age, the generator was identified as the primary suspect. A professional diagnosis confirmed the generator's failure, leading to its replacement and resolving the issue.

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4 comment(s)

Sounds familiar. I had a similar issue with my old Vauxhall Astra, although it wasn't the same as your Viano. Same symptoms though: battery low warnings, weak lights, and eventually an engine misfire because of the electrical issues. Did you check the serpentine belt? A slipping belt can cause the alternator to underperform. Also, how old is your battery? Sometimes a weak battery can mask alternator problems.

Serpentine belt seems fine, tension is okay and no visible wear. The battery… that's a fair point. It's not exactly new, but it always seemed to hold a charge. Could a dodgy battery really wreak this much havoc? Could it be the starter motor instead? I really don't want to replace the alternator if I can avoid it.

A weak battery can definitely put extra strain on the alternator, potentially leading to its premature demise. While the starter motor could be a culprit for the poor starting, the other symptoms point more towards the charging system. Given the error codes and flickering lights, I'd say the generator is the prime suspect. Probably best to get it properly diagnosed at a workshop before throwing parts at it.

Thanks for the insight! Took your advice and had it checked out. You were spot on – the generator was indeed defective. Ended up costing me around 960€ for the alternator replacement. At least the Viano is back on the road now. I appreciate the help!

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MERCEDES

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VIANOVITO