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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:

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:

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You did not list a vehicle, so here are the generic codes.
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