Code p1151 . which sensor are we talking about ? i replaced the maf sensor and i still have the problem . can i have baught a faulty sensor?? if so how do i check ?? and the sensor on the muffler closest to the oil tank has a wire that comes off it and goes into a plastic connector that connects it to another wire . the plastic peace is cracked but still connected ?? when im driving WOT, my rpms go to 4000 and then it kind of feels like it goes out of gear for a second then bucks back in . not at slow speeds though . someone help me out please . I would really appreciate that.. Ron GBA

Fuel Air sensor is the most likely cause, but can be other things.

P1151 Error Code ' VW Vortex - Volkswagen Forum

https://www.vwvortex.com > ... > Golf IV & Jetta IV
Aug 6, 2014 - Can't pass my emissions inspection with my check engine light on. Code is P1151. Possible causes: MAF Sensor, O2 Sensor, Vacuum leak.
Missing: DOC ‎' Must include: DOC

pm151: i hve 2003 jeta VR6..engine light..fuel air - JustAnswer

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Sept 11, 2009 - I have 2003 Jetta VR6 and the engine light is on and have a code reading of P1151 fuel air managing how can I trouble - Answered by a ...
1 answer · 17559/P1151/004433 - Long Term Fuel Trim Additive Air; Bank 1; Range 1: System too Lean The ECM is trying to compensate for an excessively lean mixture. ...

2001 Jetta GLS VR6 CEL Code P1151 ' VW Forum

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Jul 5, 2009 - error code P1151 "bank1,Long Term Fuel Trim, Range 1 leanness Lower Limit Exceeded". Explanation - fuel pressure or volume. Probable cause
Missing: 2.8 ‎DOC

p1151 code My 2001 vw jetta glx vr6 has a p1151 code. What

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Nov 16, 2019 - p1151 code My 2001 vw jetta glx vr6 has a p1151 code. What is the problem I need to fix? - Volkswagen Cars & Trucks question.
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2001 Jetta GLS VR6 CEL Code P1151 - Volkswagen Forum

https://volkswagenforum.com > forum > 2001-jetta-gls-...
error code P1151 "bank1,Long Term Fuel Trim, Range 1 leanness Lower Limit Exceeded". Explanation - fuel pressure or volume. Probable cause. Check engine for ...
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P1151 code and white smoke on idle - The VR6 Owners Club

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Mar 14, 2020 - Hi, i just recently bought a 2002 vw jetta vr6 24v with 123000 miles on it. Car runs good and sounds healthy but just here recently ive been ...

P1151 is indicating an problem with the upstream O2 Sensor on Bank 2. Bank 2 is the even cylinders side O2 sensor. The P0175 code indicates a rich condition in Bank 2 exhaust. This indication, if by itself, would indicate a faulty MAF Sensor or a vacuum leak, but since you already have the P1151, change the Bank 2 O2 sensor first and most likely both codes will clear.

P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2


p1131 p1151 p0171 p0174 p1131 p1151 p0171 p0174
All of these p1131 p1151 p0171 p0174 codes indicate a problem with a lean condition. This engine is known for vacuum leaks, so before you start throwing oxygen sensors at the problem, it pays to perform some diagnostics.
Start by cleaning the MAF sensor. Spray the sensor with CRC MAF sensor cleaner. Next, check the plastic vacuum lines, especially where they meet with rubber boots. If they are cracked or the rubber is swollen, replace the line. Then check the rubber elbow that holds the PCV valve. That elbow is a know failure point. In fact, the entire PCV tubing is a trouble spot on these engines. (thanks Ford).
After you've checked for vacuum leaks, check the operation of the oxygen sensors. The easiest way to do that is to disconnect the sensor from the harness. Connect one lead of your digital voltmeter to the black wire on the sensor and the other lead to battery negative. Then start the engine and add fuel (either propane, starting fluid, or carb cleaner) into the throttle body to force the mixture to rich. You should see a corresponding increase in voltage as you add fuel (from 0 volts to slightly less than 1 volt). Start and stop the fuel enrichment and watch the meter to see if the volts drop as you stop adding fuel. If you see no change, the sensor is dead. Replace it.
You can also use the fuel enrichment procedure to locate intake gasket leaks.
P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1
P1151P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2
P0174 system lean bank 2
P0171 system lean bank 1


This is the only info that didn't come back directly to FORD (yet still mentions it) instead of GM. Not to sure you got the correct code.

Possible causes - Faulty Upstream Oxygen Sensor Bank 2 - Fuel pressure high or low - MAF sensor dirty/defective - Vacuum leak on engine - Leaking fuel injector or fuel pressure regulator - Faulty Powertrain Control Module (PCM)

Read more: http://www.autocodes.com/p1151_ford.html

Hi there:
DTC P1151 is due to a failing MAF (Mass Air Flow )sensor. Before to replace some part, I suggest to clean the MAF. If the MAF code comes back on then replace it.


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Hello,
P1131 = Lack of HO2S11 switch - sensor indicates lean, ( upstream heated oxygen sensor )
This oxygen sensor is located before the catalytic converter, ( refered to as UPSTREAM )

P1151 = Lack of HO2S21 switch - sensor indicates lean, ( could be up, or downstream heated oxygen sensor ) " Downstream ", meaning after the catalytic converter.

PO174 = System too lean, ( bank 2 ) The fuel/air mix ratio is bad.

These DCT codes are generally caused by a problem with the emissions system. The following items are a few of the most common items to trigger those codes.

1. Dirty air filter. ( very common )
2. Faulty idle air control valve. ( common )
3. MAF, ( mass air flow ), sensor. ( very common )

All 3 of the above can prevent the onboard computer from determining the proper fuel/air mix ratio.
The oxygen sensors measure to insure the fuel/air mix produces maximum power with minimal emissions.

I hope this helps you.
Feel free to contact me in the comment section if you have a question.

P1131 and P1151 are for the oxygen sensors. one in the exhaust at the firewall and one at the radiator off the manifold. When both go off though at the same time I would suspect a vacuum leak after the MAF sensor(mass air flow), if only one code then suspect that O2 oxygen sensor

CODE P1151 LACK OF HO2S 21 SWITCHING HO2S SIGNAL LOW INPUT.POSSIBLE CAUSE LOW FUEL PRESSURE.INJECTORS STOPPED UP.FAULTY HO2S SENSOR LOOK FOR INTAKE AND EXHAUST LEAKS.LOOK FOR AIR LEAKS LOCATED AFTER THE MAF SENSOR MOUNTING LOCATION OR IN THE PCV SYSTEM.

DTC P1131 DTC P1151 indicates the system is correcting RICH for an overly LEAN condition. The Heated Oxygen Sensor (HO2S) voltage is less than 0.45 volts. This is usually due to a vacuum leak after the MAF. It can also be caused by a bad PCV valve or PCV system hose. It can also be caused by low fuel pressure or a plugged injector.

Start with the simple and clean the MAF and the IAT sensor. In simple terms, the engine is running lean and is being compensated by the ECM. P1131 is bank 1 and P1151 is bank2

Good luck and keep me posted.

If both, P1131 and P1151 trouble codes are set at the same time, the problem will most likely be attributed to a vacuum leak past the MAF (Mass Air Flow) sensor or something else that would likely affect BOTH banks. If the problem is only causing one code or the other, but NOT both, the problem will most likely be something that would affect one bank, like a bad O-2 sensor or a fuel injector; the most common cause of a single code either the P1131 or P1151 in my experience has been a bad Oxygen sensor.