Question about 2002 Isuzu Trooper
I took it to Autozone and it gave the codes p0171 and p0174. I did use a lucas gas addittive hoping it would help..no luck. If it is the 02 sensors, Where are they located and how difficult to rplace?
It only has 42k miles on it.
Thanks to anyone who can help.
This maybe due to an intake gasket leaking vacuum and causing a lean air-fuel mixture. Check for a vacuum leak where the lower intake plenum meets the cylinder heads. Separating the upper and lower intake manifold is not necessary. These gaskets are plastic and metal. The plastic gasket cracks causing a vacuum leak. This is an unmetered air leak and may cause fuel trim codes like PO171 and Po174 to set. There is an updated gaskets to repair the problem from Isuzu. These codes are for a lean fuel condition, not bad O2 sensors. Do you also have a rough idle?
Posted on Jan 27, 2009
Ewashmidas is exactly right. I have replaced the intake manifold gasket 4 times in a 1999 Trooper. Only last repair did I learn there is a TSB from Isuzu specifying 13 ft lbs of torque on bolts vs previous specified 18 lbs. Over tightening the bolts appears to be what is cracking the plastic gasket.
Posted on Jul 02, 2009
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Mar 31, 2014 | 2003 Chevrolet Malibu
May 17, 2013 | 1997 Cadillac DeVille
Feb 27, 2011 | 2001 Hyundai Santa Fe
Jun 02, 2010 | 2004 Ford Expedition
Apr 05, 2010 | 2003 Ford Expedition
Sep 10, 2009 | 2002 Jaguar X-Type
Aug 06, 2009 | Ford Windstar Cars & Trucks
Apr 01, 2009 | 2003 Ford Expedition
Aug 02, 2008 | GMC Sierra 1500 Cars & Trucks
890 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: