Question about Ford Thunderbird

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I have a 97 ford thunderbird w/ a 4.6 V8. It failed the emission test. P0171 - sys too lean (bank 1) & P0174 - sys too lean (bank 2). The check engine soon light is on. I want to try and clean the mass air flow sensor and see if that fixes the problem w/o messing it up. I was told they are very delicate. I don't want to break it and then have to replace if possible. What other problems might I be having to cause the light to stay on?

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  • Ford Master
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The intake gaskets are also really common to go bad and cause a vacuum leak which will also give the same codes. If they are really bad the idle will be funky on cold start up. The easiest way to figure out if they are leaking is to have the intake smoke checked. You can do it yourself by spraying carb spray around the intake with the vehicle running and listen for any change in idle.

Please be very careful when using carb spray, it is vary flamible! If there is any leak in the ignition system it can ignite the vapors from the carb spray and cause a fire!!!!!

Cleaning the MAF is a good start. They make a MAF sensor cleaner which will not harm the MAF sensor. It is available at any good auto parts store.

Posted on Sep 30, 2010

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  • Ford Master
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U have a vacuum leak at the intake is the most common source of this type of bank one and two codes

Posted on Sep 30, 2010

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97 grand marquis code P0171 bank left code with check engine light, what does that mean? also, went to start car today, turns over but no fire on the plugs at all. could this result from MAF sensor?


The MAF Sensor measures air flow into the engine
& is common to both banks or sides of the engine,so
when looking at fuel trim data you look at both banks
& remember that the maf is common to both

Your 171 is lean oxygen sensor code for bank #1,so either
a failed sensor,a slow sensor because you failed to change at
100,000 miles or a vacuum leak

A leaking injector will cause a rich condition & that report from the
O2 Sensor will cause the computer to drive fuel trim or pulse lean
as you have. So you need to do some testing & keep your thinking
cap on

Fuses never cause or fix any problems
They only open a circuit if it has too much current
flow & you don't replace a fuse, you go to wiring diagrams
to see what is on that circuit that would cause a fuse to fail
& resolve that issue

If you have no spark & no fuel injector pulse, then possibly a
crank sensor

I suggest you leave all the troubleshooting to a repair shop

Jan 30, 2013 | Mercury Grand Marquis Cars & Trucks

1 Answer

Code po171 system too leen bank 1


DTC P0171 - System Too Lean (Bank 1)
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC (Diagnostic Trouble Code) is very similar to P0174, and in fact your vehicle may show both codes at the same time.

I would suggest that you take a look at the front oxygen sensor. Typically speaking the oxygen sensor causes this code to appear. Here is the possible cause list from the manual for your car.

Trouble Code: P0171 - Fuel System Lean (Bank 1)

Possible Causes:
Air leaks in intake manifold, exhaust pipes or exhaust manifold
Base engine mechanical problem causing a lean A/F condition
Fuel control Sensor is out of calibration (e.g., ECT, IAT or MAP)
Fuel delivery component fault (clogged filter, low fuel pressure)
O2 element is contaminated, deteriorated or it has failed
Vacuum hose is disconnected, broken, leaking or loose

Hope this helps (remember to rating this answer ans leave us a testimonial comment). Thank you for using FixYa.

Oct 12, 2011 | 2000 Ford F150 Flareside SuperCab

2 Answers

I have a 98 Ford Contour and these codes. - P0708, P0171, P0442


p0708 is transmission range sensor curcuit high output, p0171 is system to lean ( bank 1 ), p0442 is EVAP emission control leak ( small ).

Mar 20, 2011 | Ford Contour Cars & Trucks

1 Answer

1994 Ford Thunderbird 4.6/V8- diagnostic codes: P0171 & P0174. What do they mean?


Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.
Symptoms

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.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook Causes

A code P0171 may mean that one or more of the following has happened:

  • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filtersmag-glass_10x10.gif may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
  • There could be a vacuum leak downstream of the MAF sensor.
Possible Solutions

Possible solutions include:

  • In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Check for a dirty fuel filter

Jan 28, 2011 | 1994 Ford Thunderbird

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

Manufacturer Specific Code P1171


Change upstreamO2 sensor on bank #1



FixYaWIZ...saailer

Dec 10, 2009 | 1997 Saab 900

2 Answers

A po171 code came on my scanner i need to know


system too lean in bank 1. clean your mass airflow sensor, replace fuel filter. iff all else fails check you fuel pump.

Nov 06, 2009 | 1998 Ford Contour

2 Answers

Ford Windstar 1996 Trouble Codes P0171, P0141, P0161, and P0174


Bank one is toward the front of the vehicle. Sounds like the heated oxygen sensors have gone bad. The Oxygen Sensors are located in the exhaust pipe and require a special socket to remove and replace.

Jan 16, 2009 | 1996 Ford Windstar

2 Answers

What is PO171 on Ford Winstar 97 3.8 liter


That's an 02/oxygen sensor code means that bank 1 or 2 is too lean. Good Luck contact if you need more help.

Dec 29, 2008 | 1998 Ford Windstar

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