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Old 07-19-2005, 11:38 AM   #1 (permalink)
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Date registered: Jul 2005
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Error codes PO170 & PO173 - ?

What exactly are these error codes - Can I fix myself - What is required to fix. Moderate mechanic
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Old 07-19-2005, 12:05 PM   #2 (permalink)
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Vehicle: ML320, S430
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RE: Error codes PO170 & PO173 - ?

I do not have access to the exact MB codes at this time but here are, as a general idea few findings:

P - Powertrain
0 - generic
1 - Emission management
73 - Fuel Trim Malfunction (Bank 1)

the P0173 might be: Fuel Trim Malfunction (Bank 2)

the info is taken from

interesting reading.
'82 300TD, '87 300SDL, '87 190E,
'95 S320, '00 S430, '01 ML320, '06 S500
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Old 07-19-2005, 05:58 PM   #3 (permalink)
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RE: Error codes PO170 & PO173 - ?

Mass Air Flow Sensor. The codes on my ML were the same for MAF.
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Old 07-24-2005, 06:31 AM   #4 (permalink)
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RE: Error codes PO170 & PO173 - ?

Thank you all. I did cave and go to the dealer. Hot dang that Starmark is a fine thing! MAF tested fine - Mechanic found a broken hose, replaced it, MAF sensor failed.[xx(]

All was well after it was replaced. Went to drive away from the dealer (O out of pocket except the $11 hose and $90 hourly rate [V]

Did not start - They gave me a free loaner, kept it and replaced the crankcase angle? sensor.

I start, I drive, all is good[:D]

Bob in service at Coggins Automall is an excellent Mercedes rep and a decent person to boot. If ever i the area and in need of Mercedes help - He is good, straight and honest.

The help I got on this forum helped me save hundreds in "Start from scratch" diagnostic fees I would have paid had I not told the mechanic where to start.

Thank you!
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Old 01-13-2011, 01:28 PM   #5 (permalink)
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I have a 2003 ML 350 which the battery was completly dead for 3 weeks and I uased a trickle charger to charge the battery and now there is numerous codes like P0270, C1020, C1045,C1026,C1046 and this shop has had the SUV for a week and does not know what is wrong with it. Any help would be appreciated.

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Old 04-19-2011, 02:58 PM   #6 (permalink)
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Vehicle: 2007 C230 Sport
Location: Northern California
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Cool OBD code 0170-0173

I have those codes also. its the first issue I have had with this vehicle. the car went to work and 4v hrs later would not start...turn over fine but no fire. I put the code reader on it and these codes came up...i put a fuel pressure tester on the test valve and the vehicle started up and is running normally but still has the error codes...i have the CPS to replace but am waiting and there doesn't seem to be a consensus on the fix. MAFS, CPS, Fuel pump...where to go?
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Old 04-20-2011, 06:26 AM   #7 (permalink)
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Codes: PO270 = Cylinder 4 Injector Circuit Low; C1025 = CAN Communication BAS Commun ication with ESP control unit faulty . . .
Sorry, I got to run and my info gathering key is not handy, maybe Greg-210 or Germantown can help you further.
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Old 04-22-2011, 12:36 PM   #8 (permalink)
Date registered: Apr 2011
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It depends on what error code is giving. Check the manual about the error code. Then you can decide that you should do it yourself or not.

Last edited by Teutone; 04-22-2011 at 01:31 PM. Reason: no active links alowed
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Old 04-22-2011, 01:27 PM   #9 (permalink)
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Generally speaking, the *best* thing to do is to get out of the "general" forum and scroll down the forums page until you see the specific forum for YOUR car (or truck). Then search/post in that forum. This one is for generic stuff arguably applicable to all benz, or of interest to benz owners generally.

Good respective luck to all.
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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