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What are 171 and 174 code on maintaince - 2001 Ford Explorer Sport Trac

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Both are lean indicators. You probably have a vacuum leak from either bad injector o-rings, or leaky intake gasket, or a cracked vacuum line.

Posted on Oct 11, 2010

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Found wires inside above gas petal should they be connected?


Thinking those are for the reset on the maintaince light ,so,
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Apr 01, 2012 | Cars & Trucks

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On my 2002 yukon 1500 I have trouble codes of 171,174, 420 what is my problem


Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 2 is generally the side of the engine that doesn't have cylinder #1.
Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.
You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.
I hope this helps.

Mar 31, 2012 | GMC Yukon XL Cars & Trucks

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Keep getting ses codes p507 p171 p174


The codes you show are all about air leaks. The 507 is about the IAC and may simply be the system noting the connection was unplugged.

The 171,174 are lean codes and usually mean more air is coming in than is needed. Did you use a water mist to check for leaks? Have you checked Vacuum solenoids for leaks?, the EGR diaphram?

You did not indicate the engine and vehicle this problem was on. Some of the 6 cylinder products had sandwich type manifolds and the upper and lower chambers had a gasket which would dissolve and leak internally.

Some people have had problems with the runners on dual plane manifolds, but I question whether a 171, or 174 could generate from this defect.

I think you should retest with a water spray after clearing the computer.

Jan 24, 2012 | Cars & Trucks

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Does maintaince include replacing timing belt


general maintaince does not include replacing the timing belt, the belt should be replaced at 80,*** miles.

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Have 60,000 and the engine maintaince light stays on,truck seems to be running fine,still! have never done anything with the engine.Does this mean simply a tuneup ?


No this means there is a emissions failure , you may or may not notice any symptoms , but your vehicle will require having the codes checked to determine which system is seeing a fault.

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1992 Wrangler: engine maintaince light comes on for 3 seconds the...


that is the engine management system checking itself,thats what its supposed to do.

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Maintaince ligth reset


It will tell you how in the owners manual if you have one. If not, try turning your ignition key to the on position without starting the car and press on the brake pedal 5 times in a row.

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The light inside is saying service 4wd swictch is going off ! what 2 do


first buy a maintence manual chiltons or haynes , the with a computer car checker check the trouble codes the maintaince manual will have the codes listed and can show you how to read them and what to tell the dealer if it requires a repair facility.

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Check engine light is on,codes 171,174,system lean,codes came back as 2 oxygen sensor's before cat/conv,do they need to be replaced or could it be something else causing it, any help would be great!!!


O2 SENSORS ARE BAD MOST LIKELY I WOULD CHANGE THEM DISCONNECT THE BATTERY FOR 5 MIN. ( IF YOU DONT HAVE A SCANNER) THIS WILL RESET YOUR COMPUTER AND SHOULD MAKE THE SERVICE ENGINE LIGHT GO OUT.

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