Question about 1999 Mercury Cougar

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My 99 cougar is running lean and has 5 error codes po171 p1131 p1151 p0420 p0174 i read the chart but dont no what they are or what the problem is ?? help

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Check the car for vacuum leak or leaks,all codes indicate a lean system which means too much air not enough fuel,get back to me if you need more help. Please rate my fix? Thanks Ray

Posted on Feb 03, 2010

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Check and clean MAF.

Posted on Feb 05, 2010

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Codes po303, po171, po137. po420


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Dec 02, 2015 | 2005 Toyota Corolla

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

1998 Ford Contour 2.5 litre, 30,000 km. Started cold after sitting for a day in -20C temperature, and idles for little while then quits, and smells like gas. Idle speed fluctuated and surged up and down...


PO171 and P1131 point to lean codes on bank PO174 and P1151 point to lean code on bank PO305 is missfire on cyl 5

the lean codes is probably a vacuum leak or maybe a MAF sensor is bad or dirty

missfire is dependant on engine if a V10 it may be a coil actually pretty likely on the modulars not uncommon thats for sure
sorry forgot to add that its says missfire on #5 cant remember if that one is the first on the left or last on the left facing the engine vacummn leak could be those dang auto hubs got it stuck in the mud and they did not engage I need to buy some new ones took them apart to clean them out this summer

Dec 16, 2013 | 1999 Ford Contour

1 Answer

2002 Lincoln LS, Enigine has bad miss. Trouble codes are po171b, po174b, po300b, po305b, po306, po420, p1131


Fix the misfire concern on cylinders 5 and 6. That will probably take care of the lean codes p0171 and p0174. The catalytic converter is probably damaged from the misfire concern....that's what is setting the p0420 code. Take care of these concerns first before fixing p1131 code

Jan 15, 2013 | Ford F-450 Cars & Trucks

1 Answer

GOT POCKET SCAN, RESULTS CODES ARE P1131,P1151,P0171,P0174,P1174


Put OBD2 Codes followed by the number into google

You can read all day long

Then study obd2 systems

Codes do not tell you what is wrong
& never to replace anything

Codes are used with diagnostic factory
manuals & trouble charts to COMPONENT
TEST never replace a thing until they fail a test
& you find a system fault

Nov 15, 2012 | Cars & Trucks

2 Answers

2000 Lincoln Navigator - few days ago started idling very rough when truck is at a stop or in park. Service Engine Light came right around time I noticed that it was idling rough when stopped. Following...


P1131 Lack of HO2S-11 Switch ,Sensor Lean
P1151-Lack of HO2S-21 Switch ,Sensor Lean
PO171- System to Lean (Bank 1)
PO174-Systen to Lean (Bank 2)

Fuel Filter -Plugged
Low Fuel Pressure
Evap System -Leaks
Leaks - in ducting,air filter to throttle
PCV -Leaks
Exhaust System -Leaks
O2 Sensors-worn out

Apr 06, 2011 | 2003 Lincoln Navigator

1 Answer

What are engine codes p1131 and p1151 mean?


P1131-- Lack of HO2S-11 Switch (lean)
P1151--Lack of HO2S-12 Switch (lean)

There are at least 26 possible causes in the
Diagnostic Trouble Code Chart

That isn't going to be a driveway job,
your going to resolve

Mar 12, 2011 | Ford F-150 Cars & Trucks

2 Answers

Service engine soon light on - codes P0171, P0174, P1131 and P1151 on a 2002 4.6L V8 Does this combination of codes focus on a particular emission component?


Hi, 1151 is an 02 sensor code, 1131 is also 02 sensor code,
0174 lean condition bank 2, and 0171 is lean bank 1. Either this is in need of a whosale of repairs or you have computer issues, From looking at the codes i would first do a complete tune up, Including wires, And inspect for a vacume leak before replacing any 02 sensors..
Take care

Aug 07, 2010 | 2002 Ford Explorer

1 Answer

99 chevy tahoe...5.7 po171,po174,po420


P0171 and P0174 Means engine is running lean-Possible a dirty mass air flow sensor (can be cleaned with brake clean) failing fuel pump, vacuum leak...

P0420 means your catalytic convertor is failing-time to see your exhaust shop

May 06, 2010 | 1999 Chevrolet Tahoe

1 Answer

Poor idle dtc P1151, P1131,P0174, P0171. runs ok


Change plugs, and Mass Air Flow sensor. This should do the trick

Nov 29, 2009 | 2003 Ford Taurus

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