Question about 2002 Ford Taurus

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Code po174 says to lean on bank 2 - 2002 Ford Taurus

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  • Mike Curtis Feb 08, 2012

    chugs when you hit it ******* the throttle. does have a slight roughness at first start up. seems fine at idle after it warms up

  • Mike Curtis Feb 14, 2012

    thank you but could not find any leaks as of yet

  • Mike Curtis Feb 22, 2012

    thank you but in the shop it goes. maybe next time



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This Code usually means that extra air is coming into the engine. The Intake manifold gasket can be leaking or a nearby Vacuum device is broken internally and is drawing in air.

To test for these leaks, with the engine running, you use an old spray bottle of water and spray around the seams of the intake manifold. Any leaks will change the RPM or stall the engine.

Check with an autoparts store for the type of gaskets your intake uses. Some of the V-6 engines used a 2 piece sandwiched design and the two halves had a gasket inbetween. After years of use,the gasket would fail.

Posted on Feb 08, 2012

  • fordexpert Feb 14, 2012

    Check with one of the autoparts stores about whether your particular engine uses manifold runners. They had different styles and activation linkages. Some had problems with the clips securing the activating rods and they would break beneath the surface. The runners on these equipped engines can soot up an fail to return to their proper position.

    For engines having the sandwiched design I mentioned earlier, the runners would divert the airflow from one chamber to another. It sounds like a little heat is needed to allow for the slightly stuck runner to fully close. This would probably be on the bank2 side of the motor.



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Posted on Jan 02, 2017

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SOURCE: vehicle failed emissions testing

You need to replace the intake upper plenum gaskets. There is two pieces, a top cover with one big silicone o-ring gasket and a lower half with six smaller silicone o-rings for the individual intake ports. You can buy these as a set, just for this job. Start this job by removing the wiper blades, then release all the screws, (including the ones that support the wiper motor), that hold that big black plastic valence at the back of the engine compartment. Pull that out of the way, you will have to pull the windshield washer hose through it, just disconnect it on the engine side, now you have access to the plenum. It's a pretty easy job now to remove and replace both halves, just a bunch of 8mm screws hold it all together. Take notes or digital pics along the way so you can pop it all back together. My only caution would be; when you have it apart, do not drop anything in the intake port! I always stuff kleenex in these while I'm working in case something slips out of my hands. Also, don't over tighten, it's all plastic. If you don't want to do it yourself, a shop should charge about an hour and a half, plus the codes must be reset and the van driven until all the monitors are ready.

Posted on Mar 26, 2009

  • 9 Answers

SOURCE: code po171 and po174. fuel bank 1 & 2

From Twitter by @carpartslocator.

@car_problems oxegen sensor oar the airflowmeter.but i do not know what kind of car you have i am gessing ford....??

Good luck.

Posted on Jul 20, 2009

  • 832 Answers

SOURCE: Generic code PO171 system 2 lean bank 1 generic

This can be caused by a faulty mass air flow sensor

Posted on Jul 09, 2010

  • 1565 Answers

SOURCE: Codes P0171 & PO174 bank

Posted on Oct 09, 2010

SOURCE: check engine light is on

Look for vacuum leaks,that are causing the O2 Sensors to go lean, and set codes on both banks

Posted on Nov 11, 2010

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Po171 po174 code

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Check engine light is on codes are po171 system too lean (bank 1) po174 system too lean (bank 2) so what can i do

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Yes my truck is 1998 ford f 150 4.2 an i have code po174

DTC code p0174 means "System too lean (Bank 1)"

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, Bank 2 is generally the side of the engine that doesn't have cylinder #1.

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