Question about 2000 Ford Ranger SuperCab

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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

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If you have a 4 cylinder there is just one O2 sensor, it is the one just off the engine and before the catalytic converter, if you have a V6 then it is the O2 sensor in the #2 engine cylinder bank which is the driver side bank of cylinders. Also the cracked connector shell HAS TO BE REPLACED. Atrached is a link that explains all the causes of this code and possible fixes.

Posted on Apr 20, 2017

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Code p 1151 refers to the heated oxygen sensor(HO2S), bank 2 running lean===causes --intake /exhaust leak/s,-- HO2S sensor bank 2 ---wiring ---ECM
replace the heated oxygen sensor ( in the exhaust manifold before the cat converter)using the correct tube spanner to avoid damage to the sensor wires
the problem of apparent in and out of drive indicates a wiring problem to the transmission in either the torque converter clutch servo/ solenoid or TCM

Posted on Apr 20, 2017


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Posted on Jan 02, 2017

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SOURCE: My 1999 Ford 4.0 has a hard miss at driving speeds

you probably have a vacuum leak and by the sound of it, it idles rough with the brake pedal depressed its your brake booster

Posted on Sep 08, 2009

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1 Answer

Does Changing a P1151 and P0175 on a ford Wind star solve the problems associated with it?

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.

Aug 05, 2014 | Cars & Trucks

1 Answer

Chevy Silverado error p1151

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.

Jul 08, 2014 | 1999 Chevrolet Silverado 1500

1 Answer

What would the car be doing if it needs a oxygen fuel sensor

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:

Jun 27, 2014 | 2003 Ford Taurus

1 Answer

P1151 code

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...

Mar 19, 2014 | 1999 Ford Ranger SuperCab

1 Answer

P1151 code polo

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.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

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Jul 13, 2012 | Volkswagen Polo Cars & Trucks

1 Answer


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.

Feb 15, 2011 | 2002 Ford F150 Regular Cab

1 Answer

What is the p1131 and the p1151 codes mean?

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

Jan 19, 2011 | 2000 Lincoln Town Car

3 Answers

I received a failed emmision test result and was given a trouble code number P1151.How can I find out what this is


Jan 15, 2011 | 1999 Ford Expedition

1 Answer

Idling rough in cold weather codes that come up are p1131 and p1151 need to know what these codes are and what parts they are

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.

Feb 17, 2010 | 2001 Ford F150 Styleside SuperCrew

1 Answer

Have engine trouble codes P1151 and P1131

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.

Nov 07, 2009 | 2001 Mazda Tribute

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