Question about 2003 Cadillac Deville

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1996 cadillac 4.6 PO174 (only)

Good idle,power, no ping

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P0174 - Fuel Trim System Lean Bank 2

Posted on Mar 06, 2009

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I HAVE CODES PO171 AND PO174 04 CADILLAC SRX 4.6L


please go to : repairpal.com/obd-II-code-po171-and-PO174 FOR MORE INFO, good-day!

Apr 17, 2014 | 2004 Cadillac SRX

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My cadillac escalade runs rough in idle.


PO174 &171- Both banks lean. This could be caused by a defective MAF or O2 sensor but something as simple as a vacuum leak could cause this problem. Also make sure there are no air leaks from the MAF sensor to the intake manifold. I have repaired many vehicles with these codes that was caused by a vacuum leak. Hope this helps

Nov 27, 2013 | Cadillac Escalade Cars & Trucks

1 Answer

I have a 2000 Cadillac Deville with 180k miles. I've been getting P0171 and a P0174 code. Yet there is no vacuum leaks. I replaced the MAF and still its idles rough once it heats up. Any suggestions?


Have you not Googled the Codes PO171 & PO174
to learn the problem ?

I would suspect you never changed the front O2 Sensors
at 100,000 miles & they both have now failed

The MAF shouldn't have been the issue

You may also have converters that are worn out
with a 14 year old vehicle

Are you changing Spark Plugs every 3 years ?

A rich fuel issue will drive the O2 lean also
Need to look at Fuel Trim on scan tool & other data

Aug 22, 2013 | Cadillac DeVille Cars & Trucks

1 Answer

How to install idle control valve on a 1996 cadillac seville SLS


It is bolted to the throttle valve (where air hose from air cleaner connects to the engine) of the intake manifold, it is pictured below with yellow circle around it.
7_11_2012_5_54_46_pm.jpg

Jul 11, 2012 | Cars & Trucks

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Very High Idle speed


no prob not and i had the exact same problem and bought the part from advance auto it was like $80 and it's a diy thing i'm an 18 year old female and could do it my self just need the part and 6 star screw driver...it's right there on the right side when you open the hood

Jan 10, 2010 | 1996 Cadillac Seville CA Value

1 Answer

1996 ranger 4.0 codes po171 and po174 come up on the screen


Check for vacuum leaks, especially the intake manifold gaskets. If those are o.k., clean the Mass air flow sensor.

Apr 12, 2009 | 1996 Ford Ranger SuperCab

1 Answer

96 toyota 4 runner won't run


try replacing your fuel filter and spark plugs, engine pinging results from a lower octane than recomended by the manufacturer and dirty gas being burned inside the combustion chamber. good luck!

Dec 02, 2008 | 1996 Toyota 4Runner

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