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VW engine system two rich off idle bank one code p2178

Posted by Anonymous on


6 Suggested Answers

  • 2 Answers

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Posted on Jan 02, 2017

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i had the same code, p2187. check to the left of the throttle body(side facing the front of the veh.
there are 2 vaccum hoses going into the intake. the larger one on top has a spring clip holding it and if you look under that you'll see a smaller one with a check valve. mine was disconnected. plugs in under the larger one.

Posted on Feb 07, 2009

  • 2 Answers

SOURCE: 99 VW Crapio

Hi Kimberly,

I am not familiar with Cabrios. I am very familiar with VW Passats and Audis (VWs in disquise) . Please read my experience with my 1997 VW Passat VR6. Since your Cabrio is a VW, it may have a very similar problem.

I had a similar problem to yours with my '97 Passat. Bank One Failed was the code I observed. To fix it, I removed the throttle body from the engine by disconnecting the air intake, two small diameter water hoses and one or two electrical plugs.

The throttle body (sounds complicated but it isn't at all) was dirty. I removed the four Torx machine screws which attach the throttle body to the engine and put the throttle body in my wife's largest stainless steel mixing bowl. I bought a large spray can of "Throttle Body Cleaner" and a cheap toothbrush. Next I spent about an hour scrubbing a thin layer of carbon deposits from the throttle body. I had to use my thumb to hold the throttle door (not a technical term :-) open and sprayed/scrubbed/sprayed/scrubbed until everything, even the very edge of the little metal throttle door, was all shiny and clean. When I was all finished with cleaning the throttle, curiosity got the best of me. I fearfully removed the cover from the electronic throttle control mechanism to see what it looked like inside. After taking a long look at it's inner workings, I carefully and reverently replaced the cover and prayed to God I hadn't disturbed anything by breathing on it. That gizmo is REALLY complicated! Some piece of German engineering.

I replaced the throttle body on the engine. I reconnected everything as it had been before. Total time less than three hours.

Next, used a trick known to sage VW Gurus around the world.

You see, whenever you

1. Replace your VW battery
2. Mess with your throttle body MUST perform a "THROTTLE ADAPTION PROCEDURE"

This sounds (and is) tricky and complicated. I didn't want to do a throttle adaption procedure because I was sure I would mess it up.

I got really lucky and found a friend of a friend who is an experienced VW mechanic. He let me in on a little secret.

John said "Buddy...

==>disconnect the VW battery for forty-two minutes."

"When you reconnect the battery, the computer chip will return your throttle settings to factory presets."

Woo Hoo! I disconnected the Passat's battery. I set the timer on my oven for forty-two minutes. When the oven timer went off, I reconnected the battery. I connected my laptop's serial port to the OBD computer port in the Passat's passenger compartment and used my Ross-Tech VCDS software to clear all of the OBD codes. Then I performed another scan. The Bank One Fail code did not re-appear!

My Passat has idled smoothly ever since!

Kimberly, I know it is hard to believe that a thin layer of carbon deposits would have such a profound effect a VW engine's idle. Apparently, this is the case. The throttle door was being held slightly open by the accumulated carbon deposits. The throttle position is so very sensitive that it caused the engine to log
the BANK ONE FAIL code.

I hope this helps you. By the way, I went to Sears hardware department and purchased the Torx socket required to remove the throttle body.



Posted on May 16, 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

  • 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

  • 1 Answer

SOURCE: 01 nissan sentra- check engine light on found

hola mi nombre es victor y tengo un nissan sentra y stoy tratando de pasarle emicion pero cuando voy para motor beiculos el carro ensendio un chec engine y me *** los codigos p0134 p0325 p0171 si tiene alguna idea que puede ser mi numero de telefono es 2039790930 y mi correo es

Posted on Dec 20, 2010

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1 Answer

What do code 2178 mean on a 2005volvo s60

DTC P2178: System too rich off idle bank 1.
Probable cause:
  1. Sensor or solenoid faulty
  2. Connector terminal contact damaged or corroded
  3. Wire harness fault. Check for correct voltage, open, short to ground or short to voltage
  4. Update control unit software - Check for latest control unit update
  5. PCM or ECM faulty
  6. Fuel mixture rich
  7. Exhaust leaks or restrictions

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Failed emission test, codeP2177,P2187,P2188 & P2195 what are these code

What make , model , an year vehicle ? These codes can mean different thing's for different make vehicles

Oct 08, 2015 | Cars & Trucks

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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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1 Answer

2007 Hyundai Entourage codes P2187, PP0174,P2189,P2195,P2270,P2272

I've come across these codes before. In almost every case there was an air leak in the intake air hose (hose between the engine air filter & the throttle body). Inspect this hose & tubes attached to it. This is especially true when the lean code includes the comment 'at idle'
P2187 - System too lean at idle Bank 1
P0174 - System too lean Bank 2
P2189 - System too lean at idle Bank 2
P2195 = HO2S Signal Biased/Stuck Lean (Bank 1 Sensor 1)
P2270 = HO2S Signal Stuck Lean (Bank 1 Sensor 2)
P2272 = HO2S Signal Stuck Lean (Bank 2 Sensor 2)

P2187 & P2189 = In order to provide the best possible combination of drivability, fuel economy and emission control, the PCM uses a closed loop air/fuel metering system. The PCM monitors the HO2S signal voltage and adjusts fuel delivery based in closed loop fuel control. Changes in fuel delivery will be indicated by the long-term and the short-term fuel trim values. The ideal fuel trim value is around 0%. The PCM will add fuel when the HO2S signal is indicating a lean condition. Additional fuel is indicated by fuel trim values that are above 0%. The PCM will reduce fuel when the HO2S signal is indicating a rich condition. Reduction in fuel is indicated by fuel trim values that are below 0%. The DTC relevant to fuel trim will be set when the amount reaches excessive levels because of a lean or rich condition

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2 Answers

Chech Engine light on so I plugged in my OBD tool and it read FUEL TRIM TOO RICH AT IDLE(bank 1).What sensor or part needs to be replaced? The vehicle is a 99 VW Passat 4cyl 1.8 turbo.

i would say the up stream o2 sensor.if you had a decent scanner you could watch the readings and know for sure.this is just and educated guess as i do not know those readings.

Jan 26, 2010 | 1999 Volkswagen Passat

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

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2002 gmc yukon, rich fuel code, low fuel pressure @40

you may have two oxugen sensors on your yukon. if so the oxygen sensor that controls that bank may be bad. from what you mentioned in your complaint, it sounds like it is the oxygen sensor.

Dec 24, 2008 | 2002 GMC Yukon Denali

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Codes po174/171 cadillac deville northstar engine

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Sep 12, 2008 | 2003 Cadillac Deville

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