Question about 1996 GMC Yukon
Maybe it loading up the converter with unburned fuel? o2 sensor going bad im told 4 their is 4 sensors.1996 gmc yukon 1500 5.7 w/miles
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
SOURCE: 02 sensors not ready
The code P0420 indicates that the catalytic converter is not functioning efficiently. This could be because the cat is damaged or the engine is not running very well and the cat cannot keep up with the emissions. You should ensure that the spark plugs and ignition components are in top shape before replacing anything else. If a compression check reveals a low cylinder, you will not be able to prevent this code as even a new cat cannot keep up with a dead miss. If the state of tune and the compression is good, then you'll likely need a cat.
I've posted the drive cycle just so you know what to do when you have resolved the code.
Do not leave the key in prior to the cold start or the heated oxygen sensor diagnostic may not run.
Posted on May 14, 2009
Tips for a great answer:
Mar 28, 2015 | Cars & Trucks
Dec 20, 2014 | Cars & Trucks
Feb 09, 2014 | 1999 Volkswagen Beetle
Jun 23, 2013 | 1994 Toyota Celica
Aug 26, 2011 | 2002 Pontiac Grand Prix
Aug 17, 2011 | 1996 Chrysler Sebring
Feb 26, 2011 | Hyundai Elantra Cars & Trucks
Feb 07, 2010 | 1996 GMC Jimmy
Jan 30, 2010 | 2002 BMW 5 Series
May 31, 2009 | 2003 Chevrolet Impala
73 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: