failed emmissions test how to correct


Asked by Apr 02, 2014 at 10:28 PM about the 2002 Mercedes-Benz C-Class

Question type: Maintenance & Repair

My C180 has not passed the emmissions test currentely reading 6.1 should read 3.0 I am told. The only suggestion so far is to rebuild or repalce engine. Please help

5 Answers

Mark Grignon

Bring it to another shop. I would give it more than one try before i replaced an engine. Before you do, put fuel additive in your tank, something that will break down carbon deposits and run it for a while to clean it out. Also change your oil if you haven't in 3,000 miles. Worth a shot IMO. Give it a tune up to improve combustion or at least put new plugs in it.

1 out of 1 people think this is helpful.

there is a additive called seafoam it works, and 1 qt of alcohol % with 1/2 tank of 93 octain run you c180 for 1hr. and take it back if and you will pass emission that old school....................

1 out of 1 people think this is helpful.
Hector Irizarry Duval

First test for compresion, its easy and cheap. if compression is ok you will need to check injectors, maf, oxygen sensors etc. when you complete the compression test return here. luck

Jan Fosen

Get some "Tuneup" additive and put into the fuel. Then run the car with the engine rpm not under 2500, for about 30min. Then you drive it with as high gear and low rpm again for 30 min. ( to make the engine really hot ) and then 30 mins at high rpms again . Works everytime


Take it to Mercedes dealer and get the car fixed right.

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