Question about 2004 Mercedes-Benz C-Class

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Mercedes clk 200 fault code p0171 system too lean bank 1

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You can easer the code by this tool, and or
In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling.
Inspect all vacuum and PCV hoses, replace if necessary.
Check for a dirty fuel filter and proper fuel pressure.

Posted on Jul 27, 2011


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98 dodge ram 1500 5.9L 2wd codes P0300, P0301, P0302, P0303, P0171. What all do I need to do to resolve??

the p0300--p0301-p0302=p0303 are misfire codes and can mean needs tune up or wiring problem and p0171 is system to lean bank 1 with this code if you correct it will probably correct the misfire codes your receiving Fixing Hesitating Car P0171 Code YouTube P0171 System Too Lean Bank 1

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4 Codes in computer

code p0128 indicates a mechanical fault ( could be the thermostat stuck open)
code p0174 -system too lean -bank2 ===causes --intake /exhaust leak--fuel pressure/pump--injectors--AIR system--hose connection/s
code po171 refers to system too lean bank 1 same as po174 with the HO2S sensor being the culprit. As to all being related . only by way of the o2 sensors
code p0442 is not connected to the first 3 as it is in a different section of the fuel system

Apr 09, 2014 | 2003 Saturn VUE

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Engine light on

P0171 ; Fuel Trim System Lean (Bank 1)
P0174; Fuel Trim too Lean (Bank 2)
fuel trim is system to modify injector pulse if system go lean it will go rich when the system is too much lean and is it code
look for 02 sensor bank 1 and 2 data
hope it helps

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Dakota p0171 p0174 taurus

code p0171 refers to system to lean bank 1==causes intake /exhaust leak--AIR system--MAP/MAF sensor--fuel pressure/pump--injectors--HO2s Have a fuel pressure test done on the fuel manifold to check for blocked filter/faulty pump/fuel pressure regulator faults
code p0174 refers to system to lean bank 2 --same causes including hose connection/s
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Sep 06, 2013 | 2009 Citroen C8 2.0

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fault code p0171 is system too lean bank 1.................. intake/exhaust leak. air system MAF/VAF sensor. Fuel pressure/pump , injectors HOS2.

fault code p0174 is system too lean bank 2...................intake exhaust leak, fuel pressure/pump , injector(s) Air system, Hose connectors

hope this helps you

Jan 07, 2012 | 1999 Ford Ranger SuperCab

1 Answer

2003 c 230 code p0171 replaced air flow sensor no vacume leaks still have code at long idle

fault code P0171 System Too Lean (Bank 1), this fault could be occurred because of faulty upstream or downstream oxygen sensor of bank one you must check the actual value of upstream and downstream oxygen sensors, if the oxygen sensor values are same both side bank one and two check subpressures for spark plugs (spark plugs wires ) and spark plugs and ignition coils, can do one thing to find out easily, swap spark plugs subpressures and ignition coil between both banks after that clear code and start if the code change to P0174 System Too Lean (Bank 2) you can understand that's the fault create by one spark plug or wire or coil then swap one by one and you be able to find which one is the faulty one replace this information helped you?

Oct 25, 2010 | 2003 Mercedes-Benz C-Class

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P0313;Misfire Detected with low fuel P0171-System too lean{bank1} P0174 System too lean{bank2} drive cycle

P0313 - Misfire Detected with Low Fuel
P0174 -System too Lean (Bank 2).
P0171 -System too Lean (Bank 1).

P0171 and P0174 mean "system too lean" for banks 1

Aug 24, 2010 | 2000 BMW 3 Series

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97 pontiac bonniville has repair code p0171

P0171 - Fuel Trim System Lean Bank 1

I recommend inspecting these following areas for faults.

1. Inspect the vacuum hoses for splits, kinks,and proper connections.
2. Inspect the crankcase ventilation valve and system for leaks.
3. Inspect the fuel for contaminates
4. Inspect the PCM and sensor grounds. make sure they are clean, tight and in the proper locations.
5. Inspect the air induction system after the MAF sensor section for vacuum leaks as well
6. Inspect for engine mechanical failure.
7. Inspect the bank 1 exhaust for leaks, missing or loose exhaust hardware,
8. Inspect the bank 1 HO2S. Make sure it is installed correctly and the electrical connectors are not touching the exhaust system or ignition wires,
9. Inspect for vacuum leaks that will only affect bank 1, such as the intake manifold area, injector O rings, etc..

If you notice any faults or damaged hardware, replace it asap.

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1 Answer

P1507 P0171 & P0174 error codes on 02 windstar

p0171 indicates the system is running lean on bank 1,p0174 means the system is running to lean on bank 2 p1507 is an idle speed under run fault i'd suspect an air leak is the cause of your problem check air intake system for airleaks

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