C250INLA

Hi,
I just had the High Pressure Fuel Pump fail on my 2013 at about 50K miles. I've read that's a common failure due to a bad design. It was replaced with a rebuild one from Mercedes that supposedly fixed the design issue. My question is, besides this common failure, are there any other's I can look out for or expect in the future?

Odd Piggy

Since Mercedes replaced the HPFP, I would assume that they did it under the extended warranty on that part.

The other more common than we would like it on the C250 is failure of the camshaft adjusters (also known as cam phasers). There is a 10 year 120,000 mile extended warranty on those. It starts as a loud rattling on start up, then hard starting, then a check engine light (CEL). Search this forum for extended warranty, camshaft adjusters. Mercedes Benz can be very particular about the specifics of warranty coverage for this.

Also, replacement of the timing chain should be considered a regular maintenance item at around 90-100,000 miles. The chain is prone to wear (often called stretch) because it is quite long and a single row chain. A chain failure or jumping teeth on the timing gear can destroy the engine. If you have the camshaft adjusters replaced, it would be wise to have the timing chain, guides, and tensioner replaced at the same time.

C250INLA

Thanks. I'll start prepping (feeling out dealer response on confirming extended warranty for the cam issue). After the fuel pump issue... I'm thinking going Toyo/Lexus for the reliability... I have just shy of 50K and the fuel pump goes???? My GM/CHevy Corvette is more reliable than that.

QUOTE=Odd Piggy;8477550]Since Mercedes replaced the HPFP, I would assume that they did it under the extended warranty on that part.

The other more common than we would like it on the C250 is failure of the camshaft adjusters (also known as cam phasers). There is a 10 year 120,000 mile extended warranty on those. It starts as a loud rattling on start up, then hard starting, then a check engine light (CEL). Search this forum for extended warranty, camshaft adjusters. Mercedes Benz can be very particular about the specifics of warranty coverage for this.

Also, replacement of the timing chain should be considered a regular maintenance item at around 90-100,000 miles. The chain is prone to wear (often called stretch) because it is quite long and a single row chain. A chain failure or jumping teeth on the timing gear can destroy the engine. If you have the camshaft adjusters replaced, it would be wise to have the timing chain, guides, and tensioner replaced at the same time.[/QUOTE]

Odd Piggy

MB has to live with what they create.
Our ‘03, ‘05, ‘15 had 186k, 182k, 155k miles before being retired. No drive train problems in any of them. No problems ever on the ‘15, only routine maintenance. They covered the ‘13 with an extended warranty. Our overall experience was good enough for us to buy a ‘21.
Guess we’ll see.

C250INLA

Thanks for the ino. Was the extended warranty on your ‘13 pump purchased or did MB issue the coverage without having to buy it? Like when bmw covered engine replace on the 5 series as a result of a class action lawsuit decision?

Odd Piggy

It was the camshaft adjusters on my C250 that failed, not the HPFP. They were covered by an MB extended warranty that was given free of charge. Others on this forum have mentioned that it was a class action settlement. I never received any notice of an ongoing law suit, so maybe it was offered to avoid legal action.

We bought an aftermarket warranty on the ‘03 and used it so little that we stopped buying them. I get your point, though. We had a mid 70s GM car that was a rolling disaster and didn’t buy another one for 20 years.

Both the camshaft adjusters and the HPFP are covered by the same type of 10 year 120,000 mile extended warranty. If your fuel pump was replaced under a warranty that you paid for, I don’t think that was proper because most of those have a deductible.