Mercedes-Benz vehicles have a reputation for being as solid as a rock. However, if they get old enough and their seals get worn out, they can also be as leaky as a sieve.

Luckily there is a solution the wiring harness issue that bypasses the expensive repair offered by a Mercedes dealer.

Today’s How-To Tuesday article will help you identify some more of those Mercedes mysteries that go bump in the night.

For those of us proudly owning a Mercedes (or any make) out of warranty, it’s easy to be a bit concerned about the cost of servicing them. It’s not cheap, no doubt, but there are still repairs you can do at home without breaking out a micro-processor to your OBD port.

You’ll have to set aside some buffing time, but there’s no doubt the finishing results will be rewarding.

The C209 and A209 with the M112 and M113 engines have an upper pulley that usually starts to show wear around the 100,000 mile mark, give or take. In this how-to, I’ll show you how to replace it, and save yourself a trip to the dealer’s service drive.

Straight pipes, cat deletes, X-pipes and more can make things confusing to even the most experienced buyer. So what is a complete exhaust mod newbie to do?