Question about 2003 Mercedes-Benz C-Class

1 Answer

Cod. fault p0172. type 203t mercedes

Cod.fault p0172.type 203t mercedes


  • emmwangi2002
    emmwangi2002 Aug 09, 2012

    can this problem show engine light?



1 Answer

Dave King

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 1,606 Answers

This means that it has detected a rich condition. You can get this with a dirty maf sensor suually caused by paper filters, a vacuum in a hose or connection or a fuel pressure problem.
Dirty mafs are easily cleaned even at home with maf spray cleaner. As long as you are careful not to physically touch the actual'sensor you can't hurrt it if it is still good.

Posted on May 31, 2012


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Hi. I went to autozone and diagnosed with code p0172 on my 2005 Lexus GX470. I have vsc trac, vsc off, anti skid, and check engine light on. The lights come on for about 100 miles and goes off for same...

You own a high end luxury vehicle as do I, 2005 ES330, the dealership is the best place to get Lexus problems fixed. With my own vehicle, I had a thermostat fault code come up, and like you it would reset itself and come back. The code said it was the thermostat and I queried it with my tyre guy. He also said it is a thermostat code. I said but it isn't overheating. He told me that the computers in Lexus are so clever they are actually looking for the water to reach x degrees in x minutes. He replaced the thermostat, the fault never came back. Anyway back to your P0172 Error code.

Possible causes
Faulty front heated oxygen sensor
Ignition misfiring
Faulty fuel injectors
Exhaust gas leaks
Incorrect fuel pressure
Faulty Mass Air Flow (MAF) sensor

The first thing I would try is that stuff that you add to your fuel to clean the injectors.

Read more:

Pull codes P0172/P0175, need help diagnoising - ClubLexus - Lexus ... > ... > IS Models > IS - 2nd Gen (2006-2013)Jul 6, 2013 - IS - 2nd Gen (2006-2013) - Pull codes P0172/P0175, need help diagnoising - My check engine light, VSC, and traction light all lit up yesterday. I pulled ... Title: 2GR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0171,P0172,P0174,P0175; System Too Lean (Bank 1); 2006 MY IS350 [08/2005 - ] DTC System too rich ( Bank 1 & Bank 2 )
26 Aug 2017
P0172 code to rich please help!
1 Apr 2017
Traction control = code P0172 and P175??
19 Jul 2014
Check engine light Code P0172
13 Jun 2004
More results from

Dirty Mass Air Flow Sensor P0171, P0172, P0174 Codes - YouTube

? 8:09
Jun 4, 2014 - Uploaded by RomanAutomotive
A common cause for lean condition codes is simply a dirty Mass Air Flow Sensor. Since I have been testing ...

code p0172 on my 2005 Lexus GX470 Google Search

Mar 13, 2018 | Lexus Cars & Trucks

2 Answers

1996 Volvo GLT 2.0 valve, got two codes need to know what to do to fix them P0440, P0172.


Dec 25, 2015 | Volvo Cars & Trucks

1 Answer

Need unlock cod for mercedes E 200 1995

call dealer parts dep. with VIN# ask for parts, they will give you the #

Jan 09, 2014 | 1995 Mercedes-Benz E-Class

3 Answers

I took my car to a mechanic for my check engine light. It came up with 9 codes. P0455, P0172, P0302, P0304, P0305, P0300, P0301, P0303, P0172. I have replaced all the plugs and wires and whatnot. (not sure...

All the P0300 codes are engine miss codes. The P0455 is a catalyst inefficiency code and the P0172 code is a rich mixture code. All of these could be caused by faulty oxygen sensors. What kind of car, engine size and mileage is it?

Feb 08, 2018 | Cars & Trucks

1 Answer

How to fix fault code p0238 on a 2004 vw passat

P0106 = Map sensor, it is out of range.
P0172 = Fuel Trim it is too rich

Go check out

Feb 11, 2013 | 2008 Volkswagen Passat Sedan

1 Answer

P0172 p0175 07 c230

Hi, these faults are for a rich self adaption mixture i.e. your exhaust lambda sensors are not detecting enough oxygen. A multitude of things may be causing this fault but I can advise on the most common. - remove the top engine cover and check the round seal at the back to ensure it is correctly fitted - ensure the air filters are not blocked - may be caused by a faulty Air flow/mass sensor - faulty lambda sensor (four fitted to this vehicle) - ensure spark plugs are ok

May 05, 2011 | 2007 Mercedes-Benz C230 Sedan

1 Answer

P0172 Fault

P0172 is a trouble code that is set when the ECU senses that there may be too much gasoline present in the air-fuel mixture of the engine. A proper air-fuel ratio of about 14.7:1 is vital to obtain maximum engine power and fuel economy

The fuel mixture grows rich and eventually, the code sets. An "over reporting" Mass Air Flow Sensor can be a common cause of a code P0172 and P0175. Essentially, this means that the Air Flow Sensor is telling the computer that much more air is entering the engine than actually is.

Feb 13, 2018 | 2004 Hyundai Santa Fe

2 Answers

5 error cods on my 2002 Jetta GLS 1.8 Turbo Engine

P0420= Catalyst System Efficiency Below Threshold Bank 1
P0300=Random/Multiple Cylinder Misfire Detected
P0301=Cylinder 1 Misfire Detected
P0172=System Too Rich Bank 1
P2181=Cooling System Performance
you need to write these down,have someone clear the codes in the car,then go for short ride and recheck which if any code's like domino's affect,one sensor can start a chain affect with the others.

Dec 09, 2009 | 1998 Volkswagen Jetta

1 Answer

I have a 2004 dodge caravan i get p0172 fault code

p0172 fuel system to rich , p2097 fuel mixture high downstream , p0480 cooling fan relay, hope this helps

Aug 27, 2009 | 2004 Dodge Caravan

1 Answer


P1390 is your timing belt is off by a tooth or two, P0172 is a rich condition fault that may be a result of being out of time

May 03, 2009 | 1996 Dodge Avenger

Not finding what you are looking for?
2003 Mercedes-Benz C-Class Logo

875 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercedes-Benz Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers


Level 3 Expert

85239 Answers


Level 2 Expert

178 Answers

Are you a Mercedes-Benz Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides