why am i having problems with my 1996 mercedes benz e320 passing the emission test

Asked by Sep 27, 2012 at 04:56 PM about the 1996 Mercedes-Benz E-Class E 320

Question type: General

7 Answers


You could need anything from a tune up to a catyltic conveter. Your best bet would be to take it to a good indipendent mechanic and give him the emissions report so he can correct the issue.


E320 with twinning cam engine have a history of e g r pipe clogging up it runs from the intake to the exhaust manifold around the back of the engine


Michael is right on. Probably the EGR pipe or the EGR valve. But you would probably have a Check Engine light on also depending on how bad the restriction is.


if you failed, then you have codes/ reasons, specify what they are and I can direct you from there....

1 of 1 people found this helpful.

Here's the answer to your problem after I hand to find out the hard way: The 1996 Mercedes e320 (and many other models) CANNOT PASS the current smog check even though THERE IS NOTHING WRONG WITH THE CAR'S ENGINE, NOR THE COMPUTER(S) THAT RUN THE CAR, and that in order for the car to be properly checked for smog emissions, smog technicians must follow the specific sequence of steps announced in the May 1, 2011 Technical Service Bulletin S-B-14.00/17a. This may include a twice repeated Drive Cycle that for each cycle will require 1 to 1 and 1/2 hours each (a two to three hour minimum process for the drive cycles alone). This problem is almost exclusive to the State of California: contact the State Department of Automobile Repair to specifically request this information, as well as a copy of the "former" Appendix J.

6 of 6 people found this helpful.

Correction: "hand" should read "had" and "Department" should read "Bureau." Good luck.


I think smartwoman answered your question but just in case, have you changed your oxygen sensors lately?

Your Answer


Looking for a Used E-Class in your area?

CarGurus has 20,867 nationwide E-Class listings starting at $1,999.


Mercedes-Benz E-Class Experts

  • #1
    Tom Demyan
  • #2
  • #3
View All

Related Models For Sale

Used Mercedes-Benz C-Class
637 Great Deals out of 25,566 listings starting at $2,100
Used Mercedes-Benz S-Class
114 Great Deals out of 7,245 listings starting at $1,200
Used BMW 5 Series
389 Great Deals out of 16,178 listings starting at $1,650
Used BMW 3 Series
951 Great Deals out of 33,308 listings starting at $1,300
Used BMW 7 Series
117 Great Deals out of 5,064 listings starting at $2,699
Used Mercedes-Benz SL-Class
60 Great Deals out of 3,232 listings starting at $3,995
Used Audi A6
137 Great Deals out of 7,829 listings starting at $1,999

Used Cars For Sale

2018 Mercedes-Benz E-Class For Sale
7,551 listings starting at $53,945
2017 Mercedes-Benz E-Class For Sale
35 Great Deals out of 1,513 listings starting at $30,000
2016 Mercedes-Benz E-Class For Sale
14 Great Deals out of 979 listings starting at $23,995
2015 Mercedes-Benz E-Class For Sale
89 Great Deals out of 1,911 listings starting at $20,990
2014 Mercedes-Benz E-Class For Sale
106 Great Deals out of 2,468 listings starting at $16,891

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.