Question about Volvo 850

Open Question

What does Bank one system too rich mean? This is code P0172B that shows under check engine light which is keeping my 1996 volvo from passing inspection.

Posted by on


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

  • 14 Answers

SOURCE: Want to know what PO172 System too rich bank 1

it means your cars computer is pumping too muchgas into your motor because it thinks the engine is either running lean possibly due to faulty o2 sensors or that the coolant temp sensor is giving false readings and the ecm thinks the car is still too cold.

Posted on Mar 02, 2009

  • 321 Answers

SOURCE: O2 Sensor Problems-1996 Isuzu Trooper

they are very easy to replace .
all you need to do is go to autozone and get the right parts.
then you will find the old parts on the exhaust system.
unplug the first one you find and unscrew it from the exhaust and refit the proper replacment part.plug wire back in.thats all you will need to do on the second one also.after that your done.ask auto zone after that to reset your codes for free with the code checker.then get a can of carb cleaner and spray out the throttle body of all the black carbon around the throttle plate.use a clean rag only.make sure its clean around the plate.
thewn fill your gas tank with supperunlead dont get the crappy gas any more cause it causes the carbon to build you will get better gas your ready for an inspection sticker.
hope this helps
keep me posted

Posted on Jul 20, 2009

  • 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

  • 23 Answers

SOURCE: I have a 97 Chevy Tahoe 4x4 with a 5.7 engine the

Hey. How many miles on it. If over 100,000, it may need new O2 sensors but unlikely both would go out of spec at the same time. You will need to install a scan tool with data stream abilitys. The pressure regulator could be ruptured which will drastically richen up both banks. If no tool, locate the pressure regulator, usually on the right side at the end of fuel rail. Make sure the vacuum line is attached and pulls vacuum. Unhook the line. The motor should sound very different and then correct itself when hooking the line back up. If there is no vacuum at the line, check for a broken or cracked area. Never overlook the simple stuff. Also need to check coolant temp sensor accuracy. It can be in tolerance but still read incorrect coolant temp. There are numerous other items that will cause a rich condition but check these first. TJ.

Posted on Nov 12, 2009

  • 571 Answers

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

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

What is a fuel trim bank 1 on a 2006 xc90 volvo an whatvis a evap emission system switching valve mean

  • P0170 Fuel Trim Malfunction Bank 1 OBDII Engine Light ... Possible Causes and Repair Information for P0170 code. Learn what does P0170 means? P0170 Fuel Trim Malfunction Bank 1
  • P0170 Volvo Fuel Trim Bank 1 - Car OBD Code Dirty air filter, air filter housing or Mass Air Flow (MAF) sensor, or faulty MAF sensor are common causes for the P0170 Volvo code.
  • P2420 Volvo Evaporative Emission (EVAP) System Switching ... Trouble Code Description: Evaporative Emission (EVAP) System Switching Valve Control Circuit High
  • P2420 Evaporative Emission System Switching Valve Control ... P2420 Evaporative Emission System Switching Valve ... Evaporative Emission System Switching Valve ... P2420 SCION Evaporative Emission Pressure Switching Valve ...

    Jul 20, 2016 | 2006 Volvo XC90

    3 Answers

    Won't. pass emission. saye 1of5 bank?

    What is the reason that it wont pass? High levels of WHAT? What is the year and make and model? Are there any check engine light codes?

    Mar 14, 2013 | Cars & Trucks

    1 Answer

    2004 Volvo S40 2.4I engine check light is on, light is cleared and returns a week later, engine drives normal with light on. codes read P0172 system too rich bank one, P0191 fuel rail pressure sensor...

    Unless is was the one doing the testing I can not say that it will fix the problem. I would check the fuel pressure, the fact you have a rich code (P0172) means you may have excessive fuel pressure and the sensor is reading that.I assume this is a four or six cylinder and you have only one bank of cylinders. Check the fuel pressure before you do any parts replacing.

    May 25, 2017 | 2005 Volvo S40

    1 Answer

    Speedometer sudenly stoppped working. now works intermittently. also shows check engine light. It is showing p0171 & p0172 codes. Lean and rich. seams like they contradict each other. occasionaly the...

    P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks.Replace MAf sensor,if cleaning the MAF does not help.
    OBD II P0172 Fuel System Too Rich (Bank 1).P0172 - System Too Rich (Bank 1) Essentially this DTC means that an oxygen sensor in bank 1 detected a rich condition.
    When the code says that the Fuel System is "too rich," it means that the computer has been subtracting more and more fuel, which is called Long Term Fuel Trim. Ideally, the Long Term Fuel Trim should be close to 1 to 2 percent. When a code P0172 is set, it means that the Fuel Trim is anywhere from -15 percent to as low as -30 percent compensated. When this happens, the computer knows that there is an improper condition in the control of the Fuel System.


    Feb 07, 2010 | 1996 Volvo 850

    3 Answers

    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.

    Jan 13, 2010 | 2000 Volvo S80

    1 Answer

    1996 chevy truck 5.7L has codes P0172, P0172 were

    p0172 is--system to rich ( bank 1). an oxygen sensor on bank 1, detected a rich condition ( to little oxygen in exhaust ) v6-v8 - v10 engines, bank 1 is the side of the engine that has # 1 cylinder. causes could be a vacuum leak in a hose, a dirty or bad maf sensor, or fuel pressure or delivery problems.

    Oct 29, 2009 | 1996 Chevrolet K1500

    4 Answers

    Check Engine light is on my 1997 F150 with a small V-8. The tester returns codes P0171, P0172, P0174 and P0175. What does all this mean?

    those codes are for lean engine condition look for vac leaks at the back of engine to the pcv valve could hear hissing noise with engine running also check egr valve to be stuck open also when was last fuel filter changed? hope this helps .

    Sep 16, 2009 | 1997 Ford F150 Regular Cab

    1 Answer

    2004 volvo s 60 check engine light on

    I would replace the bad 02 sensor and also have the engine checked for a tune up and fuel injection purge. Make sure whoever does the repairs clears the ECM memory so the light will go out. Bad spark plugs and dirty fuel injectors can cause a rich condition that a weak 02 sensor can't keep up with.

    Jan 07, 2009 | 2004 Volvo S60

    1 Answer

    Check engine light on

    P0101 : Mass air flow censor, Air intake is blocked or the sensor is nackered.
    P0172: System too rich bank 1. There's too much fuel, probably to do with the air fuel mix. If you sort the air flow meter that'll sort the two.


    May 21, 2008 | 2001 Volvo V40

    Not finding what you are looking for?
    Cars & Trucks Logo

    Related Topics:

    353 people viewed this question

    Ask a Question

    Usually answered in minutes!

    Top Volvo Experts


    Level 3 Expert

    79024 Answers

    Colin Stickland
    Colin Stickland

    Level 3 Expert

    22326 Answers

    Ronny Bennett Sr.
    Ronny Bennett Sr.

    Level 3 Expert

    6927 Answers

    Are you a Volvo Expert? Answer questions, earn points and help others

    Answer questions

    Manuals & User Guides