Question about 2003 Cadillac Deville

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Codes po174/171 cadillac deville northstar engine

The car is idling rough and when mashing the accelerator down to floor
car will shutoff i replace mas in air cleaner hose no change

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  • jason randeau Jan 14, 2009

    98 cadillac deville, car runs rough and p0171 ,p0174 come up.

  • Anonymous May 05, 2009

    i have the same problem with a 97 deville 4.6 northstar engine what excactly does it mean. p0174 p0171 wtf do i check it got me going crazy

  • ana vel Nov 08, 2009

    where is safety switch on a 96 caddy deville

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Check for vacuum leaks around the intake. This is the most common cause for these codes.

Posted on Mar 16, 2009

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These are the trouble codes description, well some what gives you a start where to look for... Auto zone will give you a print out of your codes for free in dallas...



P0170 - Fuel Trim Bank 1
P0171 - Fuel Trim System Lean Bank 1
P0172 - Fuel Trim System Rich Bank 1
P0173 - Fuel Trim Bank 2
P0174 - Fuel Trim System Lean Bank 2
P0175 - Fuel Trim System Rich Bank 2

Posted on Dec 18, 2008

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I have a 2000 Deville base with the northstart 4.6.....I cleaned, sprayed and even replaced the mass airflow & map sensor and still the same shaking at idle and codes were present. This is a vacuum leak issue no doubt so I removed the intake plenum and noticed that the inner connection hose to the intake fitting had a small crack, clean thorough and check....I had removed twice before I noticed it.....This is the problem you guys..you just cant see it sometimes.,,,,and It worked after replaced,,,then clear the codes......p.s ,and you will had to replace the intake gaskets as well while doing this...it cost me $14.00 and 1hr & 30 mins of my time..

Posted on Aug 19, 2012

  • Tony Fortner Jun 03, 2013

    I am having the same issue with my 2002 Deville.. I bought it new and it has 152000 miles on it.. It has been the best car that I am have ever owned. This is making me nuts and with the wife driving it... it makes me crazier.. UGH women..lol Sean,, Is it really that easy to do? I am very good with cars,,, just never had to do anythign on the Northstar

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I had same codes.. O2 sensors.. Upstream/Downstream. Ran great after 4day I got P1640

Posted on Jun 13, 2016

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