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0172 CODE, SYSTEM TOO RICH, BANK #1 - 1998 Volvo V70

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Code can be caused by many things including, but not limited to...

  • leaking fuel injector
  • vacuum leaks
  • bad O2 sensor
  • base engine problems
  • spark plugs
  • ignition coil(s)

you will need a professional scan tool and some tools to diagnose the concern correctly, but if you want to just start replacing stuff I start with MAINTENANCE stuff first

Seab

Posted on Jun 06, 2010

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Posted on Jan 02, 2017

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SOURCE: Check engine light (emission system service required) Help?!?!

There may be problem with the mass air flow sensor (very common with Volvo). This causes the fuel system to malfunction.

You may have noticed increased fuel consumption, loss of power and general 'lazyness'.

Better to take it to authorized Volvo service for a checkup/fix.

Posted on Jan 16, 2010

bschilz
  • 2049 Answers

SOURCE: Diagnostic failed code reads PO172B Fuel Trim

Basically this means that an oxygen sensor in banks 1 and 2 detected a rich condition (too little oxygen in the exhaust).

A code P0172 may mean that one or more of the following has happened:
· The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters can cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
· There could be a vacuum leak
· There could be a fuel pressure or delivery problem
Possible solutions include:

  • Inspect all vacuum and PCV hoses, replace if necessary
  • Clean the MAF sensor. Consult your service manual for its 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 fuel lines for cracks, leaks, or pinches
  • Check the fuel pressure at the fuel rail
  • Check the fuel injectors, they may be dirty. Use fuel injector cleaner or get them professionally cleaned/replaced.
  • Check for an exhaust leak before the first oxygen sensor (this is unlikely to cause the problem, but it is possible)

Posted on Oct 07, 2009

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1 Answer

Code 0172, what am I looking 4 on 4.2 in 05 Chevy Trailblazer EXT?


code P 0172 ( if you are using an OBD-11 scanner ) refers to system too rich bank 1====causes --intake blocked --EVAP canister purge valve ---fuel pressure excessive ---EGR valve ---injector/s-- HO2S ( heated oxygen sensor in the exhaust manifold or pipe before the cay converter)
if the engine is performing well, the the first unit to replace is the HO2S as it controls the air/fuel mixture

Mar 07, 2017 | Cars & Trucks

1 Answer

Code 0172 pop up on 1998 Volvo s70 and the maf code didn't or the o2 code didn't what could it be?


code p 0172 refers to system too rich, bank 1===causes ---intake blocked --EVAP canister purge valve ,---fuel pressure ---EGR system---injector/s---heated oxygen sensor (HO2S -the one in the exhaust manifold before the cat converter)

Nov 24, 2016 | Volvo Cars & Trucks

1 Answer

What do dtc's po172,po300,po455 mean together


code p 0172 refers to system too rich bank 1=== causes --intake blocked --EVAP canister purge valve ---fuel pressure --EGR system---injector/s---HO2S ( heated oxygen sensor )
code p 0300 refers to ransom/ multiple cylinder/s ---misfires detected===causes --spark plug/s---HT lead/s---injector/s---coil/s - low compression
code p 0455 refers to evaporative (EVAP) emission system--large leak detected ===causes ---hose connections --intake leak--- EVAP canister---EVAP canister purge valve
AS a side idea , check that the fuel cap is properly installed first as it may not be properly tightened or fitted

Feb 24, 2016 | Cars & Trucks

1 Answer

Diagnostics trouble Code P0172


code p 0172 refers to system too rich, bank 1===causes ---intake blocked , EVAP canister purge valve , fuel pressure ---EGR system---injector/s--HO2s sensor ( heated oxygen sensor in the manifold / before the cat converter of bank 1 )
eliminate blocked intake or both banks would be rich
EVAP purge valve will be giving definite other symptoms --difficulty filling, poor running after filling-- consider it after the rest
EGR will be giving codes for both banks as it feeds back into the inlet manifold---possible but save your money till last
injector --could be a leaking /faulty tip or seal at base of injector
HO2S most likely as it is affected by heat and the wires do break
First port of call
fuel pressure would affect both banks -- would not hurt to have it checked at some time
So if you are doing it yourself , I suggest the oxygen sensor first , followed by the injector/s, followed by fuel pressure ,followed by EVAP then the EGR valve

Jan 19, 2016 | 2001 Ford Escape

1 Answer

I have the codes are po171 ..po174


code p 0171 refers to system too lean bank 1===causes --intake /exhaust leak---air system---MAF/VAF sensor--fuel pressure / pump---injector/ s---HO2S
code p 0172 refers to system too rich, bank 1===causes --intake blocked ---EVAP canister purge valve --fuel pressure --EGR system---injector/s -=-- HO2S
code p 0173 refers to fuel trim(FT) bank 2--malfunction===causes --intake leak---air system--fuel pressure /pump---injector/s --EVAP canister purge valve---HO2S
code p 0174 refers to system too lean, bank 2===causes intake / exhaust leak---fuel pressure /pump---injector/s---Air system---hose connection/s
I was not sure if you wanted all codes or just the first and last, however you will see that there are some common problems that may help point you in the right direction
1-- is the heated oxygen sensor (HO2S) which is the sensor before the cat converter
2--is the fuel pressure , so a fuel pressure test will determine if a regulator or fuel pump problem,
3--EVAP canister purge valve --replace as required
4--intake / exhaust leak --check for vacuum hose failure including hoses to vent controls and check the flexible exhaust connection before the cat converter for leaks
The rest are there to check if you haven't fix the fault before you get to them

Nov 05, 2015 | Cars & Trucks

1 Answer

I need to know what code means 0172 and how much it cost


P0172 is "system too rich Bank 1"
There are many things that can cause this. The vehicle should be taken to a capable shop and be diagnosed and give you an estimate for repair.
P0172 System Too Rich Bank 1

Oct 13, 2015 | Cars & Trucks

1 Answer

P 0172 and p 0175


fuel system too rich #P0172 (bank1)
fuel system too rich #P0175 (bank 2) answers from code reader manual
I would check fuel regulator and fuel pressure readings

Dec 05, 2011 | GMC Sierra Cars & Trucks

1 Answer

98 GMC 3500 5.7 idles rough and has a code of p-0172. What should I look for to resolve this


I don't know how much you know about cars or the code but p0172 is a rich fuel trim code for bank 1, I would recommend a fuel injection cleaning service, if your injectors are dirty they will drip instead of mist, this can cause the rough idle and the running rich code, I would also recommend cleaning your throttle body, I had a rough idle issue on mine, and i noticed a big difference afterwards but I didnt have the code. Also check your O2 sensor for bank 1. One other thing to check would be your mass air flow sensor, take a look at it, if its dirty try cleaning it, If you use an oiled air filter like a k&n, excessive oil can cause problems with the maf, this is less likely than the first two because this would more than likely affect both banks not just bank 1. Hope this helps.

Nov 09, 2011 | 1998 GMC Sierra

1 Answer

Code 0172 system too rich


P0172 - System Too Rich (Bank 1)
Basically this means that an oxygen sensor in bank 1 detected a rich condition (too little oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC is very similar to P0175, and in fact your vehicle may show both codes at the same time.


Symptoms: You will more than likely not notice any drivability problems, although there may be symptoms such as a misfire.


Causes: A code P0172 may mean that one or more of the following has happened:
* The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters can cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
* There could be a vacuum leak.
* There could be a fuel pressure or delivery problem


Possible solutions include:
* Inspect all vacuum and PCV hoses, replace if necessary
* Cleanthe MAF sensor. 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 fuel lines for cracks, leaks, or pinches
* Check the fuel pressure at the fuel rail
* Check the fuel injectors, they may be dirty. Use fuel injector cleaner or get them professionally cleaned/replaced.
* Check for an exhaust leak before the first oxygen sensor (this is unlikely to cause the problem, but it is possible)


Hope this helps (remember to rate this answer).

Jan 07, 2011 | 2005 Chevrolet Venture

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