P0172 OBD Engine Code Logo   Code #P0172 -
System too Rich (Bank 1)

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the engine starts but it shakes too much, it does the same when is running and it feels weak, no power and a lot of fume come out from the muffler.

Nissan X-Trail

Chevrolet Optra
codigo p0172

checking all wires and plugs changed speed sensors

running rich on cold startup, ok warm

took 60+ mile drive in hilly & twisty terrain on a 70+ degree spring day. 2005 kia rio, oil change 7 days ago & air filter changed dec '12. looking up what's most important to try 1st to avoid wasting $ assuming it's either cheapest or most expensive fix.

Ford E-150

Toyota Yaris
Engine Light on, car start yes, car shake yes, idle roughly yes

Volkswagen Beetle
Engine light came had code check said PO172 map sensor had been clean seem to run okay

Just had code checked map sensor was clean a week ago same code back again

Volkswagen Beetle
Code PO172 had map sensor clean back on again in a week engine seem to be running okay


Chevrolet Trailblazer
does start, no vibrate, not rough, reduced power

it appear the code and i can not clear that.. and it is working good but the code doestn clear

Kia Rio
the car works good but the check engine light is on. i tried to clear but it doesnt clear..

p0 300 po 172

po172 po300


Chevrolet Impala
P0172 is indicative of Bank 1 running too rich (receiving too much fuel) on V-type engines or high performance inline engines. It causes the check engine light to illuminate, but beyond that, the car runs and drives as it should, often times with no noticeable difference in performance. Possible causes could be, but are not limited to, dirty or faulted Mass Air Flow sensor, dirty injectors, clogged PCV valve or hose, or damaged vacuum line.

when i start the truck it idles roughly then check engine light comes up giving me a PO170 bank 1 to rich.

Dodge Dakota
what should the injectors read

Lincoln LS
rough idle while stopped rotten egg smell loss of power rpm wont go over 2000

rough idle while stopped rotten egg smell loss of power rpm wont go over 2000

Toyota Rav4

Pro 172

Chrysler PT Cruiser
i have my car engine too much shake

what make it run rich

Pontiac Montana
what makes it run rich

Hyundai Elantra
All the above occurred on my car Please advise Hyundai elentra 2008

Mercedes-Benz ML350
Check the MAF sensor signal!

code po172, miss fires on 2, 4, cylinders

car back fires

No trying to get some answers on how to correct the issue

Chevrolet Optra
p0432 code chart diagnotics

Chevrolet Optra
p0432 code fault

no power wont go over 10 mph. misfiring. replaced plugs and all 4 coils

Chevrolet Caprice/Impala
reduce power


Ford Focus

Buick Regal
2002 Buick V-6. Has had intermittent problem of engine stalling at idle, or while driving with foot off gas pedal. Replaced upstream and downstream O2 sensors. So far so good. Cleared fault code with my code reader, code has not reappeared, engine has not died on me yet.

none just the mil light on

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Tell us about Code #P0172

When did your Check Engine Light Come On?
Does your Car Start?
Does your Car Vibrate? Shake?
Does your Car Idle Roughly? Reduced Power?

Even if you don't know the fix, please provide us all details about your experience to help others!

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P0562 Chrysler PT Cruiser
Got this code after car won't start meaning low voltage...battery good so taking off altenator to get it checked . I was hoping it was a broken belt but wasn't..Didn't realize they had two belts originally.One goes to alt.only

P0121 No acelera a más de 1500 rpm y una vez se le cambio el sensor de pedal de acelerador y funcionó y un mes después lo volvió a generar y no se que más pueda se

Other Check Engine Light Codes

P0082   Intake Valve Control Solenoid Circuit Low (Bank 2)
P0501   Vehicle Speed Sensor Range/Performance
P0712   Transmission Fluid Temperature Sensor Circuit Low Input
P0740   Torque Converter Clutch Circuit
P0779   Pressure Control Solenoid 'B' Intermittent
P0799   Pressure Control Solenoid 'C' Intermittent
P0838   Four Wheel Drive (4WD) Switch Circuit Low
P0871   Transmission Fluid Pressure Sensor/Switch "C" Circuit Range/Performance
P0877   Transmission Fluid Pressure Sensor/Switch "D" circuit Low
P0964   Pressure Control Solenoid "B" Control Circuit/Open

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