Question about 2001 Ford Explorer Sport Trac

1 Answer

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

Posted by on


1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 10 Answers

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


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Found wires inside above gas petal should they be connected?

Thinking those are for the reset on the maintaince light ,so,
no. Unless the maintaince system light runs.

Apr 15, 2013 | Subaru Cars & Trucks

1 Answer

On a Chevy Hhr has p0014 code what needs repaired?

P0014 Camshaft position B over advance,or system performance bank 1.Clear the code,This appeared from either logic or rational.Camshaft postion usually appear on vehicle that are not in oil maintaince,this sensor has a tendency to get sluge built in it.This also appear when driver run the fuel very low,clear the code if it reappear its a hard code and a replacement or a service (clean it with gas or carb cleaner)it. is the solution

Apr 01, 2012 | Cars & Trucks

1 Answer

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

1 Answer

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

1 Answer

Does maintaince include replacing timing belt

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

Aug 18, 2011 | Hyundai Motor 2002 Sonata

1 Answer

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.

May 30, 2010 | 2004 Ford F150

1 Answer

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.

May 17, 2010 | 1992 Jeep Wrangler

1 Answer

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.

Aug 27, 2009 | 2002 Acura 3.2TL

1 Answer

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.

Jul 09, 2009 | 1994 Jeep Grand Cherokee

1 Answer

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!!!


May 19, 2009 | 1999 Ford Ranger SuperCab

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

116 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

78936 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers


Level 3 Expert

5676 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides