Question about BMW 325i

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Need vacuum hose diagram for a 2003 325i bmw. I have a fault code that says to lean bank 1...im thinking its a vacuum line leak

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: OBD fault code P0171

vacuum leak

Posted on Jun 26, 2008

  • 1 Answer

SOURCE: Bank 1 & 2 running lean

The lean condition is caused from the upper intake gaskets and isolation bolts not sealing properly due to time and poor sealing qualities from the factory ther was a service bulliten for this through ford to replace the gaskets,bolts,vaccum line,and lh side valve cover for this concern the oil was getting onto the rubber contaminating it causing a vaccum leak. If you never had the tsb done i would start there, also if there is high milleage on the vehicle i would also clean the maf sensor and resedt kam.

Posted on Dec 04, 2008

warlock61
  • 659 Answers

SOURCE: check engine light

this is very common on these. the upper intake seals leak and should be replaced. It is not a noticable vacuum leak and is usually worse when the engine is cold. It is not a very difficult job to do

Posted on Mar 01, 2009

  • 1861 Answers

SOURCE: Vacuum leak-P0171 2000 Toyota Echo. Need vacuum diagram

A P0171 code does not indicate a vacuum leak; it indicates a dirty mass air flow sensor. This device is located between the air filter box and the intake manifold. Locate it, unplug the wire harness, and remove the 2 screws that holds it onto the intake pipe. Look down inside th sensor, you will see 2 small wires, that are probably covered with fuzzy things...using a spray cleaner, such as brake cleaner, spray the 2 wires until they are clean and shiny. Do NOT use compressed air, that will damage the sensor. When it is clean; reinstall it and drive it. The computer will recognize the now clean sensor, and your troubles will be over.

Posted on May 19, 2009

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Failed emissions with 2001 BMW 325i. Codes given were P0313, P0171 System too lean Bank 1, and P0174 System too lean bank 2. What do these codes mean?


Those codes mean the fuel to air ratio is to lean, not enough fuel. This is caused by quite a few things, most common is a intake manifold vacuum leak or other source (like hoses and the brake booster) A problem with the MAF (mass air flow) sensor can cause this as well if it is reading the incoming air volume wrong.

Feb 27, 2017 | 2001 BMW 325i

1 Answer

1998 pontiac Bonneville codes p0171 what should I do first to fix this


DTC P0171: Bank 1 system too lean. Probable cause:
1. Wire harness fault. Check for correct voltage, open, short to ground, short to voltage
2. Fuel pressure problem. Check pump, regulator, filter, and lines
3. Exhaust leaks or restrictions
4. Vacuum leaks. Check for damaged hoses or incorrect routing
5. Fuel contamination
6. Incorrectly installed sensor

Jul 22, 2014 | Cars & Trucks

1 Answer

Error code 0171


DTC P0171: Bank 1 system too lean. Probable cause:
1. Wire harness fault. Check for corect voltage, open, short to ground, short to voltage
2. Fuel pressure problem. Check pump, regulator, filter, lines
3. Exhaust leaks, restrictions
4. Vacuum leaks. Damaged hoses or incorrect routing
5. Fuel contamination
6. Incorrectly installed sensor

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1 Answer

Bmw x5 4.4i code p0430


p2187 system too lean bank 1
p2189 system too lean bank 2
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You have some air leak. Gaskets/broken hoses.

Mar 16, 2014 | 2006 BMW X5 4.4i

1 Answer

Po171 po174 code


Lean bank 1 and bank 2 , and throttle actuator system fault. Check reason for lean codes 1st, vacuum leak(s), air inlet boot and hoses, or low fuel pressure / clogged filter. Repair as needed then clear codes and recheck .

Jan 09, 2014 | Cars & Trucks

2 Answers

Hissing sound in the back of the engine


It sounds like you definitely have a vacuum leak. Trace your vacuum lines coming out of the intake manifold. There should be a diagram under the hood, on the shroud or on the underside of the hood. If not Google search the vacuum routing for your vehicle. Its possible that you have a line that has been rubbing against something causing a hole, a line could have broken because the heat dries them out and they crack, (plastic lines) or a vacuum line could have just popped out of its grommet. Hope this helps.

May 12, 2017 | 2003 Ford Focus

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Bmw 2882/3 fault codes present


You most likely have an engine vacuum leak or a defective mass airflow sensor or low fuel pressure. Read the codes with a OBD2 code reader and see what the standard codes are.

Oct 14, 2012 | Cars & Trucks

2 Answers

2007 kia sedona vacuum leak


Before I bought the Mass Airflow Sensor, I looked up the codes again for the 2007 3.8L Kia Sedona. One listing was "massive vacuum leak". I took all the hoses and debris collectors off of the engine, and upon close inspection; the large air hose that connects the air filter to the intake manifold was dry rotted at ALL the ridges. I flexed the hose a few times and saw where the vacuum leaks were occurring. I also removed the EGR hose for inspection and found the hose was faulty as well. Since these parts are "dealer only", I used duct tape to seal the leaks as a temp fix, filled the gas tank and used fuel injector cleaner. Disconnected the neg. battery terminal, reset the codes, and the check engine light turned off. Runs like a champ now. Vehicle has 119,000 miles so I guess wear and tear like this is to be expected. New hoses from online parts dealer totaled 130.00. I got off easy I think.

Aug 19, 2012 | 2007 Kia Sedona 3.8

3 Answers

97 pontiac bonniville has repair code p0171


P0171 - Fuel Trim System Lean Bank 1

I recommend inspecting these following areas for faults.

1. Inspect the vacuum hoses for splits, kinks,and proper connections.
2. Inspect the crankcase ventilation valve and system for leaks.
3. Inspect the fuel for contaminates
4. Inspect the PCM and sensor grounds. make sure they are clean, tight and in the proper locations.
5. Inspect the air induction system after the MAF sensor section for vacuum leaks as well
6. Inspect for engine mechanical failure.
7. Inspect the bank 1 exhaust for leaks, missing or loose exhaust hardware,
8. Inspect the bank 1 HO2S. Make sure it is installed correctly and the electrical connectors are not touching the exhaust system or ignition wires,
9. Inspect for vacuum leaks that will only affect bank 1, such as the intake manifold area, injector O rings, etc..

If you notice any faults or damaged hardware, replace it asap.


Sep 18, 2009 | 1997 Pontiac Bonneville

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