ML320 PO170 and PO173 error codea - Mercedes-Benz Forum
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#1 (permalink) Old 10-08-2011, 08:33 PM
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Angry ML320 PO170 and PO173 error codea

Bought 2000 MB ML320 3.2L GAS with 188K (about 117000 miles) on it. Oil check light was on! I replaced Oil level sensor with Mercedes genuine Oil level sensor from Discount Body Parts, that solved the problem light went out it's OK. However, check Engine light is still on and I am still getting PO170 and, PO173 error codes! so far I replaced MAF with Generic MAF sensor from SOCAL MERCEDES PARTS I cleared the codes several times but light comes right back on after SUV is driven 10-15 miles!! I still got the old MAF sensor should I try to clean it out first (can anyone suggest a cleaner?) also is generic part OK?. What else might be triggering this "Check engine" light to glow menacingly like this? ML320 is running great but fuel mileage is poor. Any help would be greatly appreciated!! frustrated in Hamilton, ON.,THANKS
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#2 (permalink) Old 10-08-2011, 09:49 PM
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CRC MAF cleaner. Most stores carry it.

If you have not had ALL MB SPECIFIC codes read then a pro grade or MB SDS scan tool will be needed
to pinpoint the problem. Throwing more parts at it is futile at this point.
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#3 (permalink) Old 10-08-2011, 11:29 PM
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Originally Posted by Seacap View Post
Bought 2000 MB ML320 3.2L GAS with 188K (about 117000 miles) on it. Oil check light was on! I replaced Oil level sensor with Mercedes genuine Oil level sensor from Discount Body Parts, that solved the problem light went out it's OK. However, check Engine light is still on and I am still getting PO170 and, PO173 error codes! so far I replaced MAF with Generic MAF sensor from SOCAL MERCEDES PARTS I cleared the codes several times but light comes right back on after SUV is driven 10-15 miles!! I still got the old MAF sensor should I try to clean it out first (can anyone suggest a cleaner?) also is generic part OK?. What else might be triggering this "Check engine" light to glow menacingly like this? ML320 is running great but fuel mileage is poor. Any help would be greatly appreciated!! frustrated in Hamilton, ON.,THANKS
Thank you for prompt reply. When I got the car couple of months ago I replaced spark plugs and installed KN air filter this made no difference light CEL (what does that stand for?) was still on, '00 ML320 was scanned by qualified mechanic codes printed out all 8 pages of it, vacuum system was checked for leaks by back pressuring the system with smoke. Incidently old MAF was showing no life on the scanner but replacement caused the graph to register data immediately. Despite these heroics engine check light is still stubbornly lit up? My mechanic is baffled and actually suggested I post a thread on the website and see if other people can give us some ideas on how to put the lights out pardon the punt.
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#4 (permalink) Old 10-09-2011, 12:20 AM
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Seriously?

Paying a mechanic to have you find out and tell him what the problem is and how to fix it is like taking food to a restaurant, giving it to the chef, and telling him how to prepare the meal...and then leaving him a tip.

There are myriad possibilities, but rule one is to take it to a qualified mechanic (defined, at a minimum, as one who doesn't send you to an internet forum to research issues so you can pay him or her to fix them).

Good luck.

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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#5 (permalink) Old 10-09-2011, 10:55 AM
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Your point is well taken. This is my first performance engine so I need to educate myself on how to go about fixing this and possible cost involved. Qualified mechanics like the ones at MB dealer can and will relief you of hundreds of dollars if you let them put one over on you and reading other posts about PO170, PO173 nightmare I am not the only one looking for suggestions.
So far I am out MAF sensor (n/c for SDS scan) his $10K MB SDS spits out PO170 and PO173 codes. I have 8 page print-out of 2005 Mitchell Repair Information Company, LLC (this maybe SDS's software) would this contain the "ALL MB SPECIFIC codes" I need? some examples would be helpful.
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#6 (permalink) Old 10-09-2011, 11:11 AM
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It is odd that he has a MB SDS and prints out Mitchell sheets. It should be printing
MB printouts from DAS/Xentry and WIS (MB lingo).
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#7 (permalink) Old 10-09-2011, 12:53 PM
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Quote:
Originally Posted by Seacap View Post
Your point is well taken. This is my first performance engine so I need to educate myself on how to go about fixing this and possible cost involved. Qualified mechanics like the ones at MB dealer can and will relief you of hundreds of dollars if you let them put one over on you and reading other posts about PO170, PO173 nightmare I am not the only one looking for suggestions.
So far I am out MAF sensor (n/c for SDS scan) his $10K MB SDS spits out PO170 and PO173 codes. I have 8 page print-out of 2005 Mitchell Repair Information Company, LLC (this maybe SDS's software) would this contain the "ALL MB SPECIFIC codes" I need? some examples would be helpful.
First read about DTC anatomy. Generic OBDII codes for power train management have format P zero XXX. More details here. OBDII - Diagnostic Trouble Codes - Anatomy of the DTC
Searching this forum for PO173 gets 27 hits. Searching for P0173 gets 145.

Educate yourself and your mechanic on subject of mixture adaptation and Long Term Fuel Trim. What it does, what is it for, what affects it and so forth. Here is good start. Google the rest. http://www.mercedestechstore.com/pdf...2004-01-01.pdf

Concept of power train management works same way in Mercedes and Geo or Kia. It is not something reserved for high performance engines.

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#8 (permalink) Old 10-09-2011, 07:30 PM
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I would not have used a generic MAF sensor. Just my 2¢.
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#9 (permalink) Old 10-09-2011, 07:48 PM
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Thanks for your reply. Had I joined this forum a week earlier I would have got that message loud and clear however, it may not be too late to return it yet.
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#10 (permalink) Old 10-09-2011, 07:50 PM
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My mistake I don't know make/model number of the SDS he uses however, if you're familiar with this software there is something here that reads under heading:

SELF-ADAPTATION OF MIXTURE FORMATION AT ITS LIMIT-FAULT CODE DESCRIPTION
ME-SFI -AD07.61-P-4000-09AA

1A Fault code PO218 for right cylinder bank (PO170)
(USA Readout on generic scan tool) P2087 for left cylinder bank (PO173)
-------------------------------------------------------------------------------------
1B Engines 112, 113 as of 1/01 P2018-[1] for right cylinder bank, mixture
correction too great
PO170
Fault code P2018-[2] for right cylinder bank, mixture
correction too small
PO170
(USA Readout on generic scan tool) P2087-[1] for the left cylinder bank, mixture
correction too great (PO173)
P2087-[2] for the left cylinder bank, mixture
correction too small (PO173)

could a qualified technician seeing this readout deduce: this points to a problem and here is how you fix it !!! your input is greatly appreciated.
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