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HOW TO FIX CODES 171 AND 174 - 1999 Ford Ranger SuperCab

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Fault code p0171 is system too lean bank 1.................. intake/exhaust leak. air system MAF/VAF sensor. Fuel pressure/pump , injectors HOS2.

fault code p0174 is system too lean bank 2...................intake exhaust leak, fuel pressure/pump , injector(s) Air system, Hose connectors

hope this helps you

Posted on Jan 07, 2012

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Posted on Jan 02, 2017

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I'm looking at the code book and ALL codes are 4 digit codes, EX POO56, POO57 and PO161. If these are What you are getting, they all are codes for the left and right hand oxygen sensors. Could be wiring, Sensor itself or ECM

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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.

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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.

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I have a 96 gmc seirra with 5.7L


you need to figure out what the codes mean then fix that problem when you do that you will have to reset the computer this should fix your problem

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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.

May 19, 2009 | 1999 Ford Ranger SuperCab

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Codes


RF2560 -  Remote Keyless Entry Validation fault - dealer fix RS0061 -  Right front position sensor fault - dealer fix IP1552 - KAM error (keep alive memory) power loss to instrument panel? - dealer fix IP2419 - instrument panel (unsure) 
I would talk with a dealer re fixes to all these codes. Unless you're a great mechanic and understand advnanced principles of electronics, let the experts fix your expensive (or to fix at least) car.
Sorry not to have better news. Community colleges offer cheap classes in auto repair...
Paul

Nov 01, 2008 | 1996 Cadillac DeVille

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