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2003 Jetta GLI throwing P1151 Indicating a lean condition

Brought the car to a local repair shop to get my O2 sensor installed (previous code). After the repair, I get this code indicating a lean condition.
The shop checked for vacuum leaks, fuel pressure, and O2 sensor operation. All of them appear to be fine. The car seems to run fine. Fuel economy is a bit low side. They are suggesting a fuel injector clean but seem unsure if it will fix the problem.
This is starting to get expensive and frustrating fast. Any insight would be great. Please don't copy the OBD trouble code info. Already have it.
Thanks.

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5 Suggested Answers

CaptainKeyz
  • 202 Answers

SOURCE: have this code PO171, what does this mean.

Not sure that the O2 sensor was bad. It sounds like it was telling you that side of the exhaust system was picking up a lean mixure at the O2 sensor. The O2 sensor was doing its job by telling you the mixture changed. If the O2 sensor was bad, it would say low voltage range for that sensor, or open curcuit.
Now the car has had time to do its diagnostic sweep, it is telling you the same thing, but from a different sensor...the fuel mix is too lean. Air/spark/and fuel is what you need in the correct amounts. In your car, the ECM engine control module controls this by taking readings from all the sensors several hundred times a second.
Mechanically, you have a few options. Change the fuel filter...under the car on the passenger side. It is an easy job.
Change the fuel pressure regulator. This keeps the fuel at 4 BAR so the fuel injectors can do their job correctly. This job just needs a screw driver to pop off the clip that holds it in place. No hoses need to be removed. It is on top of the intake manifold, in-line with a metal fuel line and a rubber one.
The fuel injectors could be clogged up on one side of the engine. Run some fuel injector cleaner through a tank of gas. Also, listen for a constant ticking sound at each injector. If one sounds off PAR, then replace it.
The fuel pump may not be giving you enough power. However, the readings seem to be localized to one side, so I doubt it.
Start with the easiest thing, and see if it works. Also, you will need to get yourself a VAG scan tool. It is the only one with codes in it for all of your VW systems, not just engine codes like the ODB scanners. You can get a nice one for $50 on-line.
Good Luck!

Posted on Feb 24, 2010

  • 2 Answers

SOURCE: Trouble codes

what does the code p1128 mean

Posted on Sep 28, 2008

ewashmidas
  • 362 Answers

SOURCE: 2001 2.0 jetta manual tranny engine light on

Here are the test procedure for a PO171 code.

1. Check and verify there are no vacuum leaks or unmetered air leaks.

2. Check and verify air filter, all inlet screens and throttle body are clear and clean (never use an aerosol cleaner to clean a throttle body, damage to the throttle body electronics may result. Use a rag dampened with cleaner to wipe the throttle clean)

3. Check and verify fuel pressure is 36 PSI at idle with vacuum to the fuel pressure regulator.

4. Check Mass Airflow Sensor (MAF) Grams/Second (G/S) readings as follows:

Idle (about 830 RPM) 3.5 G/S or more (4 to 4.5 G/S preferred).

2500 RPM no load, 9 to 15 G/S (11 to 12 G/S preferred).

Wide Open Throttle (WOT) road load (drive vehicle at 45 MPH in 3rd gear and perform a WOT acceleration, observe maximum indicated MAF G/S readings) 90 or more G/S should be present, (prefer above 100 G/S).

A MAF that exhibits consistently lower than normal G/S readings can cause a P0171 code to set. Please let me know if this information is helpful. Positive feedback is appreciated. Thank You!

Posted on Mar 21, 2009

  • 69 Answers

SOURCE: p0171 lean code will not go away. changed fuel

Double check the very small hose that comes off of the manifold, since it sits so close to the manifold, I would not be surprised to find it frail and broken.

If you have tried everything else, have you had the code cleared after you changed out the parts? try having it cleared again....

Posted on Aug 21, 2009

  • 11 Answers

SOURCE: 1995 jetta 2.0 fuel pump

ok could be a few things.

Have you changed the inline fuel filter? these usually have paper filter elements and after a while can be clogged with moisture which blocks fuel flow. The fuel pump will still have good pressure but the fuel rail will lack the flow required and you may burn out an injector as its running too lean. Secondly, the MAF sensor, could be dirty, clean it with electrical cleaner.

I think its more likeylt the fuel filter blocked. Try and bypass it if possible, reset the ECU and try agiain

Posted on Mar 06, 2010

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1 Answer

Have codes indicating bank 2 running lean(po174,po153,po159) also have codes for misfires on all cylinders. Does the misfire trigger o2 codes or does bad o2 sensor cause misfires?


misfire could cause o2 codes. o2 sensors are measuring the oxygen in the exhaust - if you're sending unburnt fuel through there (like a misfire), it would throw the value way off. if you're getting a 'lean' error, I would first suspect a bad fuel injector. But you are having a misfire on all cylinders... I would then look at the ECU as it may be having issues sending the 'open' signals to the injectors.

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When you have both codes at the same time, it indicates that both bank 1 & 2 O2 sensors are reporting lean condition. If only one code appeared it is usually a bad sensor, but with both codes, it is probable that it really is running way to lean. This is usually caused by a vacuum leak. Make sure you intake hose from MAF sensor (air filter box) to intake is secured and has no leaks, then move on to looking for, vacuum hoses leaking, intake gaskets leaking etc...

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I will try to paste an article for you. Several sources indicate this is a Bank 2 O2 sensor problem and that it is failing to switch and adjust for the fuel mix. But as you can see, many defects can lead up to this O2 sensor Code 1150.

I would try to use a spray bottle of water and go around the Intake manifold and spray the water while the engine is running. An intake leak will draw water into the engine and change RPM.

If no success then try changing the O2 bank 2 sensor. You may need to wipe the computer and clear the Code. H40 DTCs P1131, P1132, P1151 AND P1152: UPSTREAM HO2S NOT SWITCHING. DTC P1130: FUEL SYSTEMicon1.png NOT SWITCHING AT FUELicon1.png TRIM (RICH OR LEAN)
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•HO2S-21 = DTCs P1151, P1152 and P1150
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•Contaminated fuel injector(s)
•Vapor recovery system
Induction system
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•PCV system.
•Improperly seated engineicon1.png oil dipstick.
EGR System
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•Leaking diaphragm.
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•Check air cleaner element, air cleaner housing for blockage.
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1 Answer

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If the voltage at the PCM is low as the scanner shows, but the voltage at the sensor responds and goes rich, locate and repair the open circuit in between the PCM and O2 sensor connector.

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MFG Specific

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O2 Sensor trying to correct for a rich condition,
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I have 27 Possible Causes in the Diagnostic
trouble Code Chart

Common DIY

Worn out Sensor
Too Much Fuel Pressure,doubt that
Leaking Injector,maybe
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PCV Leaks
Oil dip stick not sealed
Egr ,issues
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