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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21854
Experience:  BEng hons Mech engineering, in auto industry 22 years
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mercedes 2003 c-class 200 k0mpreeser engine management light

Customer Question

mercedes 2003 c-class 200 k0mpreeser engine management light on and showing codes p2029 and p2046
Submitted: 2 years ago.
Category: Car
Expert:  Matt replied 2 years ago.
Hello

thats a code for running too lean and may be caused by a vacuum leak

these engines and models had a recall for vacuum lines that are located UNDER the supercharger, they would tear and cause this code,

so it would be woth contacting your local dealer to have the recall work carried out if its not already been done

The best way to locate a leak is to have the engine running and warm and then spray lighter gas /propane around each joint in turn. If the engine rev's up you've found your leak.
Now you might think that spraying lighter gas around a hot engine isn’t wise, however the flash /ignition point of gas is about 400°C so you need a naked flame or spark to set it off and I’ve used this method for many years without incident.
Work your way through each possible joint one at a time and you should find it. I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to provide a spraying 'wand' and allow a direct blast of gas into each area, especially those difficult to reach with large implements.

It’s also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all result in insufficient fuel being delivered to the engine

Expert:  Matt replied 2 years ago.
hi Simon

do you still need help ?