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Code 171. How to correct - 2000 Ford Windstar

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What does it mean? The Oxygen sensor (O2 sensor) in the bank one exhaust head pipe assembly before the Catalytic converters is indicating that the bank of cylinders is running lean. Since the engine is a V6 and has 2 O2 sensors, one for engine cylinder bank 1 and one for engine cylinder bank 2, this means in most cases the O2 sensor is defective, it the engine was running lean both O2 sensors (bank 1 and 2) would indicate a fault. In this Van Ford recommends that the O2 sensors for banks 1 and 2 ALWAYS be replaced as a matched pair from the same manufacturer. The best sensors are made by DENSO and BOSCH. To replace the sensors you need a special O2 socket tool, they are available from any auto parts store, you will need a completely cold engine, then you will need to jack up the front of the van and support it on safety stands, once the Van is up get under it, at the rear of the engine in the exhaust head pipes you will see the sensors, these are the sensors that are before the catalytic converters, the catalytic converters look mufflers. The sensors are 7/8" and screw into the exhaust pipes for each cylinder bank, remove them being careful not to break any of the O2 sensors wiring routing clips, the new sensors are then screwed in place and the wiring clipped back in place exactly as it came out, this is important! Once the new sensors are installed disconnect the battery negative black cable for 5 minutes to clear the system of the fault code. Below is a picture of the cylinder banks of a Ford V8, bank one is always where the #1 cylinder is located.


Code 171. How to correct - emissionwiz_72.gif

Posted on Mar 30, 2011

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Code 171


According to the page I found at Toyota, it's a "Random cylinder mis-fire" - meaning it is not happening consistently. Here is the site for the code 300: http://engine-codes.com/p0300_toyota.html.

Also according to the same site, on this different link, is your code for the 171 which states that it is a " fuel mixture system being lean on bank one" of your engine. The site goes on in substantial detail in both cases to tell you what the cause could be and how to fix them. Best of luck with it, hope you can do it yourself. Here is the other link: http://engine-codes.com/p0171_toyota.html

Jun 15, 2014 | 2010 Toyota Corolla

1 Answer

Need help with codes 300, 301, 306 and 171


Well code 300 is a random miss, 301 is for cylinder 1 and 306 is for cylinder 6. Code 171 is saying the fuel mixture on bank one is too lean. And that could cause the other codes.
Have you checked fuel pressure and the filter ?

Jan 31, 2014 | 1999 Toyota 4Runner

1 Answer

97 ford expedition has a code 171 and 174 bank 1 and 2 lean what do i do to fix this


Code 171 and 174 are for bank 1 and 2 running too lean. The engine has compensated as rich as it can go, and it is still to lean. This does not necessarily mean your mixture is bad, but something (a sensor) is telling the ECM to correct lean. The oxygen sensors alert the ECM to how lean/rich the exhaust is, and then the ECM trips a code. Maybe you have a bad oxy. sensor, but since there are 4 of them (2 per bank), I don't think they could all go at once.

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1 Answer

How to fix error codes p0171 and p0232


Code 171 is for the fuel mixture on bank one is too lean, and code 232 is for a problem with the fuel pump circuit.
Code 232 could cause code 171 or 171 could be something going on with one of the O2 sensors.
You would need to take a scanner and watch the activity on the O2 sensors, and check base fuel pressure with a gauge.

Apr 07, 2013 | Ford Five Hundred Cars & Trucks

1 Answer

PO 171 and PO 174


You did not list a vehicle, so here are the generic codes.
Code 171 is system lean bank one and code 174 is system lean bank two.
The computer is getting a signal from the O2 sensors saying the fuel system is too lean, and the computer can not make it rich.
Possible causes are low fuel pressure, vac leaks, EGR valve problems, and so on.

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1 Answer

Code 171 How to correct problem


change the isolator bolts and the gaskit this will remove codes 141 171 i did this over the summer of 2010. you can get the parts at ford dealership.took me about 4 hours .

Mar 30, 2011 | 2000 Ford Windstar

2 Answers

Code PO 171


http://www.automotiveforums.com/t473813.html

PO 171 is a system to lean code. This link will explain why this is and how to fix it,

Mar 02, 2010 | 1998 GMC Sonoma

1 Answer

98 chevy lumina. Code 113, 102, 171. runs then


the code 113 is intake air temp cicuit, high input.
the code 102 is mass air flow volume air flow circuit, low input.
the code 171 is system too lean (bank 1)
I sure hope this helps you out. Dont sound like anything too major though

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Bmw 3 series e46 1999---- fault code 171


171 check, fuel supply system short circuit to b+
Check all positive (b+) fuel system electrical components. Injectors, fuel pump, regualtor, etc.

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