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Stock or modified exhaust? Posted by MI-Roger [Email] (#882) [Profile/Gallery] (more from MI-Roger) on Mon, 20 Jan 2014 12:04:31 In Reply to: P0420, Peter Robson, Fri, 17 Jan 2014 22:54:59 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I had this code issue with my 2000 9-5 about 45K miles AFTER installing a 3-inch dowmpipe with smaller performance catalyst. My issue was most likely caused by a catalyst that was at end of life, and I eliminated the code by installing a specialized anti-fouler as Anders mentioned.
If your car has stock exhaust and only started the problem following installation of the ECU tune then Saabmedic's comment makes the most sense, the ECU is looking at the rear sensor before the catalyst is fully hot.
Driving style and outside temperatures can also impact this. I would only have issues in cold weather when driving easy and sensibly. A heavy foot would generate more catalyst heat, non-winter time temperatures allowed the catalyst to heat faster, either one would prevent the code from appearing.
->Posting last edited on Mon, 20 Jan 2014 12:05:46.
_______________________________________ Saabs owned: 2008 9-5 Aero Sedan, sold at 227K miles 2006 9-3SC 2.0T - Wife's daily driver 2000 Viggen Convertible - Sold May, 2022 1964 Quantum IV Formula Car - Retirement project 2000 9-5lpt Sedan, sold at 318K miles
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