Question about 2002 Buick Century
Had in-laws car checked @ the dealer for lack of power earlier on. Came back with back converter. They're price was too high so had done elsewhere. After replacement, getting code P0420, which is catalyst efficiency error. Did correct run time for cat to lite up, checked 02 operation and the post 02 sensor wasn't switching properly. Replaced. Week later still getting code. Checked for alternatives ie high octane gas. possible bad converter..but wondering if anyone has access to TSB's for the above vehicle. Wondering if there was a PROM update to reduce the sensitivity of the calculation for aftermarket 02 sensors, so the code doesn't set as much. Didn't get much help from the dealer service advisor when I asked him.
Sounds as if yoou are actually having a fuel system problem.You need to rreplace the fuel filter and then check the fuel pressure. You should have around 50 psi. If the fuel filter stops up it will cause the exhast to starve for fuel and can damage a catalyst converter. You can get the fuel filter for about 15 dollars at any local parts house.
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:
Oct 16, 2015 | 2002 Buick Park Avenue
Jan 16, 2014 | 2002 Buick Century
Mar 10, 2017 | 1998 Buick Century
Aug 25, 2011 | 2002 Buick Century
Jun 14, 2011 | 2002 Buick Century
Mar 02, 2011 | 2002 Buick Century
Sep 25, 2009 | 2005 Chevrolet Avalanche
Mar 04, 2009 | Buick LeSabre Cars & Trucks
949 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: