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.

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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!

Other Comments

P0508 smart fortwo Pure
Engine light on when the car put in reverse, it make a loud noise as soon as you release the brakes pedal. Also in drive only when the car completely stop at the traffic light, as soon you release the brakes pedal again the car launched forward with a jerking motion, after initial move everything is smooth when the car already in motion.

P0350 ihave change all the plug in ignition coils and still nothing happens,, i also replace all spark plugs but still i have a rough idle

P0222 Hola mire mi comioneta es 2006 ford F150 v8 mi problema comenso cundo el Mecanico me digo q tenia q cambiar la ponpa de gasolina y luego recorri como dos dias y cundo prendo comcomiensa a temblar y no se acelera y luego cambio el cuerpo de aceleracion y camino un dia y hoy se prende tiembla mucho y no se acelera y me precenta estos códigos pp2104 p0122 p0222 p2110 y no se ya quemas hacer porq ya me a cobrado como alrededor de $1000 alguien me podria decir q puedo hacer

P0757 shift Solenoid B Stuck On

P0147 Chevrolet Astro
check engine light come on van vibrate& shake van do start

Other Check Engine Light Codes

P0080   Exhaust Valve Control Solenoid Circuit High (Bank 1)
P0285   Cylinder 9 Injector Circuit Low
P0419   Secondary Air injection System Relay 'B' Circuit
P0423   Heated Catalyst Efficiency Below Threshold (Bank 1)
P0660   Intake Manifold Tuning Valve Control Circuit (Bank 1)
P0791   Intermediate Shaft Speed Sensor Circuit
P0864   TCM Communication Circuit Range/Performance
P0880   TCM Power Input Signal
P0903   Clutch Actuator Circuit High
P0986   Shift Solenoid "E" Control Circuit High

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