Question about 1997 Cadillac DeVille

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P0171 & P0174 1997 Deville

Check Engine Soon light goes on and when checked, these are the only codes showing. What is the fix?

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  • Cadillac Master
  • 803 Answers

Lean bank 1and bank 2, possible vacuum leak , restricted fuel filter or low fuel pressure.

Posted on Dec 27, 2013

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6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: 2003 Cadillac Deville a check gas cap error appears with svc engi

put a new gas cap, those system are pres. even if
the cap look ok it maby leaking replace with a new
one it should solve your prob.
eng.ligh come on because of the gas cap

Posted on Apr 09, 2009

motor1258
  • 6674 Answers

SOURCE: Check engine light on, 1997 cadillac Deville.PCM codes

PO135 is oxygen sensor Bank1 sensor1. PO404 is EGR.
personally, I'd pull EGR off, clean pintle good with throttle body cleaner or carb cleaner, re-install, erase codes & try it for a while & see if it code(s) come back.

Posted on May 07, 2009

  • 7 Answers

SOURCE: Cadillac Deville 2000- Engine check light code P0741

If you like go ahead and let someone sell and replace your transmission but here is my suggestion! Check around and see if you can find a minor vacuum leak! This can simply be the big round hose that goes from the fuel injection to the power brake hub! This is normally a push in connector which has about a 1/2 inch hose clamped on it! If there is any kink or the connector is not in correctly a leak will occur and the transmission will shift rough as though you will be thrown out of the vehicle! Try unplugging this connector and plug it back in hard and straight and maybe you will be lucky and fix your problem. If the vacuum is correct your transmission will shift better than you have ever experienced!

Posted on Aug 16, 2009

  • 115 Answers

SOURCE: current codes on in 2004 cadallic deville b0429 b1819 p0741

b0429 rear seat temperature control,b1819 rear wiper motor,p0741 clutch converter

Posted on Sep 13, 2009

1fastbob
  • 301 Answers

SOURCE: my 2001 cadillac deville keeps giving me dtc code system to lean

Anytime I get a too lean DTC I first change the fuel filter if it hasn't been changed in awhile. You'd be surprised how many times this has helped.

Good Luck with it.

Bob

Posted on Oct 22, 2009

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Codes po303, po171, po137. po420


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Dec 02, 2015 | 2005 Toyota Corolla

1 Answer

How to fix codes P0171 & P0174


Determining exactly what of the thousands of parts on a modern car is broken is as difficult as doing the repairs many times. IN this video you'll learn how to diagnose and fix error codes P0171 and P0174 on a 2001 Ford Escape, which indicate vacuum problems.http://www.lightdeal.co.uk/

May 17, 2013 | 1997 Cadillac DeVille

1 Answer

P0171 p0172


Here's code PO171.Here's code P0172.

May 08, 2013 | Ford Explorer Cars & Trucks

2 Answers

1999 nissan altima can service engine light soon cause 4 cylinder to loose pressure?


You have a bad intake or exhaust valve

Major Repair

Check Lights are just an indication of a system
fault code set in vehicles computer

You use the codes to help diagnose the issues
if they are of any help

Codes & Sensors that produce check lights- just indicate
that something is not to programmed Emission Specs
& only component testing will find the problems

Dec 12, 2012 | 1999 Nissan Altima

2 Answers

2004 suzuki verona emissions issue. Check engine light stays on. Shows no error codes, says mixture lean. Can you give a solution?.


A few things to check:
1. A bad intake manifold gasket
2. A missing O ring gasket between the air filter cover & the MAF sensor.
3. A dirty fuel filter.

What's the code? P0171 & P0174 would indicate a vacuum leak. P0171 could be the MAF sensor. Good luck, I'm still fixing all my Verona's annoying "quirks".

Feb 20, 2012 | 2004 Suzuki Verona

1 Answer

OBD2 "check engine lite" shows


Both codes are system too lean bank 1 & bank 2. First place to start is any obvious vacuum leaks. Look for broken,collapsed or missing vacuum lines. Check egr valve & intake manifold also.

Dec 14, 2010 | 2003 Cadillac Escalade Ext

1 Answer

Ford windstar check engine light comes on after stopping when starting to get moving again shows p0171 & p0174 codes why??


P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks. P0174 OBD-II Trouble Code


Technical Description

System Too Lean (Bank 2)


What does that mean?

Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust.

Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.

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Thanks.


Dec 17, 2009 | 2002 Ford Windstar Cargo

2 Answers

My 2001 cadillac deville keeps giving me dtc code system to lean


Anytime I get a too lean DTC I first change the fuel filter if it hasn't been changed in awhile. You'd be surprised how many times this has helped.

Good Luck with it.

Bob

Oct 22, 2009 | 2001 Cadillac DeVille

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