Question about 1996 Mercedes-Benz C-Class

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My car is 1991 c class and it is about to roll over to 105,000 miles and it won't pass emission test. I think it needs a new muffler.

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I have change the catalyc converter on my mercedes because has failed the MOT on 135.000 miles. The new one was 200 quid and my car passed the MOT :) Good luck!

Posted on Aug 27, 2008

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I replaced battery but now it won't pass emission test because the "Drive Cycle" wasn't reading. What do I need to do to "read"?


Your vehicle needs to relearn itself, and run tests on the emissions equipment.

Your car is a rolling smog machine. The law requires that the computer test ALL of the emissions parts regularly.
Items such as engine sensors and misfire counters can easily be checked by virtue of the engine running. But SOME components aren't computer components. So to test them the car must be driven for a period of time, in a certain manner so that the computer can test them (fuel cap, catalytic converter, EGR valve, etc.).

When you disconnect the battery, the computer loses the results of the last test (pass or fail) and registers a "not ready" status during the test.

Most of the techs can manage to clear nearly all of the MONITORS in less than 10 miles or so. To see how this is done, do a "Google" for OBD II DRIVE CYCLE, and read the procedure.
If you are unfamiliar with this protocol, simply drive your car for 50-100 miles or so, but not all at one time. It needs some cold starts, some warm-up time, some stop and go and some easy freeway cruising. Then take it back for re-test.

Oct 17, 2015 | Chrysler Pacifica Cars & Trucks

1 Answer

Will an engine bought from a 1999 Silverado originally sold outside of California pass California emissions


There are two type of emission classes.

Federal and California emissions.

Look under the hood for the emission class sticker.
Smog check station's machine in CA are programmed to handle both types.

You do not need to change anything before the inspection.

==== Side notes: You should check the service record for the last Catalytic converter,O2 sensors and EGR valve change.
Service interval for
Catalytic ~180,000 miles O2 ~150,000 miles EGR ~160,000 miles


If you can locate the last smog test (even from out of state) Check for the
CO NOx


Aug 10, 2011 | 1999 Chevrolet Silverado 1500

2 Answers

My 87 voyager won't pass emissions test.. I put complete tune up and oil change on it after it failed. Now the inspections place said it made it worst. I know the belt to my air pump is in bad shape ,...


You change oxygen sensors? thoses are now considered part of of tuneup on high mileage engines,plus if you drive highway for 30-49 miles before going gettting emissions testing you get better results.

Aug 07, 2011 | 1987 Plymouth Voyager

1 Answer

Honda Accord 1991, the car can't pass the smog check. what do you think is the problem?


Probably the old catalytic converter. Could also need a good tune up with new spark plugs and a fresh air filter. You can buy a universal catalytic converter relatively cheap at a good auto parts store. Take it to a good muffler shop and have it installed. Shouldn't be more than $60.00 labor. Be sure to keep the old converter. You can recycle it and recoup some of yo money. If you leave it with the muffler shop, they will recycle it and get that money, plus what they charged to install the new one. With the new plugs and air filter, the fuel will burn more efficiently. And the new catalytic converter will take care of the rest. You should be able to pass the smog test, and get better gas mileage and performance.

Feb 17, 2011 | 1991 Honda Accord

1 Answer

My 1991 Sonoma idals low and will not pass emissons


You may have a worn out O2 sensor or catalytic converter. Maybe time for a tune-up?? Is the check engine light on?

May 29, 2010 | 1991 GMC Sonoma

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Check engine light on; Gas milage went from 19 to 15, emission ba


YES!!, you had it tuned, it runs good, but gas mileage dropped, and check engine light is on,it sounds like the o2 sensors are slow or even dead, i would replace them for sure and that just might solve all your problems,good luck, hope this helps.

Apr 20, 2010 | 1991 Mazda B-Series

1 Answer

I can not get my 97 saturn SL1 to pass emission i have changed an oxygen sensor and cleared codes the emissions place tell me to drive it because the monitors are not ready for the oxygen sensor and...


When all the monitors have run their tests then it will pass emmissions providing that your repairs were successfull...You need to drive it for at least 75 miles so that it can complete its tests....

Feb 13, 2010 | 1991 Saturn SL1

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My car just failed smog emissions test, had high nox count, at 15 miles about double max allowed, at 25 mit iles per hour, triple max allowed. The car is a 91 plymouth voyager.During the test it smoked...


i would put a good tank of gas in the system. like 93 super.drive the car for about 1 week or at least 100 miles. i would also go to a good auto parts store.u should be able to buy a bottle of engine cleaner to pass the smog test.also when u bring the car in for the inspection.take it for a rideand get it nice and warmed up.

Mar 10, 2009 | 1991 Plymouth Voyager

1 Answer

Emission system problem


fill your muffler with SOS pads just before your test a wire coat hanger can remove them after the fact..
good luck its how i got my prelude to pass inspection in vancouver bc canada

Jan 16, 2009 | 1998 Ford Expedition

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