Code Explanation Needed - PeachParts Mercedes-Benz Forum

Battlecat714 · #1 10-23-2006, 10:20 PM

Does anyone know the meaning of code 21: "Purge switchover valve-open or shorted?" on a 95 e320?

mbdoc · #2 10-24-2006, 08:05 AM

That is just a POORLY written code definition!

That code 21 on that car means that the purge valve isn't pulling enough vacuum on the MAP sensor! Most likely a dis-connected vacuum line, inop switch-over valve, OR bad purge valve.

Battlecat714 · #3 10-24-2006, 11:07 AM

okkk, so how do I go about finding a solution to it besides looking around for a disconnected vacuum line?

Mike Freeman · #4 10-24-2006, 04:22 PM

The most common cause other than a bad valve is a leaking vacuum line at the piezo sensor located under the windsheild washer tank.
Good luck and post your fix. Mike

Battlecat714 · #5 10-25-2006, 03:00 AM

hmm, ill take a look down there then...thanks Mike! be back later with the results.

Qamar · #6 10-25-2006, 07:32 AM

Correct me if i am wrong. The code 21 on this car means: Oxygen sensor or circuit. Check both of them.....

Arthur Dalton · #7 10-25-2006, 09:55 AM

Quote:

Originally Posted by Qamar

Correct me if i am wrong. The code 21 on this car means: Oxygen sensor or circuit. Check both of them.....

Incorrect twice.

Code 21 is purge valve system malfuntion and 124.032 has only one 02 sensor.

Battlecat714 · #8 10-25-2006, 11:10 PM

Quote:

Originally Posted by Arthur Dalton

Incorrect twice.

Code 21 is purge valve system malfuntion and 124.032 has only one 02 sensor.

no leaking vacuum line...Arthur, you got any ideas?

Arthur Dalton · #9 10-26-2006, 05:14 AM

The purge valves get full of crap from the canister and stop pulsing..you clean them out with WD40.

Help with codes for '94 C280

Battlecat714 · #10 10-26-2006, 08:06 PM

went from bad to worse...I now have #2 error code, damnit

.

kth286 · #11 10-27-2006, 04:43 AM

Battlecat714

What exactly are the problems with your car ???????

Do you have the diagnostic plug with the inbuilt LED and push button ???

mbdoc · #12 10-27-2006, 08:30 AM

Y58/1 is the purge valve..left inner apron.

Battlecat714 · #13 10-27-2006, 04:39 PM

Quote:

Originally Posted by kth286

Battlecat714

What exactly are the problems with your car ???????

Do you have the diagnostic plug with the inbuilt LED and push button ???

Error codes 2,5,21.
Level of difficulty:
2-Bad o2 sensor=easy
5-Bad EGR Valve=easy
21-Bad Purge Valve=the wd40 cleaning didn't work, so maybe order a new one?

Arthur Dalton · #14 10-27-2006, 05:29 PM

I Like your level of difficulty chart.
Don't assume a code means a part change .. that is more often not the case.
These codes simply mean that a fault has been detected on that system that did not pass the self test. These are Emissions codes only.
An example on a 104 would be a code 5.. very seldom does this code get rectified by changing the EGR valve, but rather clearing out the intake egr tube port at the the engine...hardly an EASY job..
Whenever one wants a clearer picture for diagnostics on these HFM systems, it is best to see what codes are coupled up with the emissions codes from the actual Engine Management modules.

Battlecat714 · #15 10-27-2006, 08:23 PM

Quote:

Originally Posted by Arthur Dalton

I Like your level of difficulty chart.
Don't assume a code means a part change .. that is more often not the case.
These codes simply mean that a fault has been detected on that system that did not pass the self test. These are Emissions codes only.
An example on a 104 would be a code 5.. very seldom does this code get rectified by changing the EGR valve, but rather clearing out the intake egr tube port at the the engine...hardly an EASY job..
Whenever one wants a clearer picture for diagnostics on these HFM systems, it is best to see what codes are coupled up with the emissions codes from the actual Engine Management modules.

oh of course, and that's what i'm not hoping that EGR tube that leads into the back intake and into the engine is not clogged up. I will change the o2 sensor this weekend leaving me with the two others. Hopefully I will be able to clean the EGR Valve and with time again, clean the Purge valve. Thanks for the advice Arthur.