Cod. fault p0172. type 203t mercedes

P0172 LEXUS - System Too Rich Bank 1
Possible causes
Faulty front heated oxygen sensor
Ignition misfiring
Faulty fuel injectors
Exhaust gas leaks
Incorrect fuel pressure
Faulty Mass Air Flow (MAF) sensor
https://www.autocodes.com/p0172_lexus.html

code p 0440 refers to evaporative emission (EVAP) system---malfunction===causes ---hose connections ---intake leak---EVAP canister purge valve
probably the purge valve needs replacing

code p 0172 refers to system too lean, bank 1===causes --intake blocked , EVAP canister purge valve ---fuel pressure ---EGR system---injector/s HO2S
you will notice that the purge valve is in both codes and it also affects the fuel pressure by not venting the tank correctly
That will account for the fuel pressure problem
I would seek advice from an accredited service specialist that works on your type of car but I would be paying attention to the common fault ( purge valve) before any thing else

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

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?

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



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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

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.

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 reappears.it's like domino's affect,one sensor can start a chain affect with the others.

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

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