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19bonestock88 · 07-14-2019, 01:44 AM

Car is throwing an 0420 code, you know, “catalyst efficiency below threshold”... it runs in closed loop though and over 95% of the time runs totally fine

07-14-2019, 01:44 AM	#229 (permalink)
19bonestock88 Master EcoModder Join Date: Jun 2016 Location: KY Posts: 1,351 IGL - '04 Saturn Ion Team Saturn 90 day: 56.19 mpg (US) Thanks: 63 Thanked 365 Times in 268 Posts	Car is throwing an 0420 code, you know, “catalyst efficiency below threshold”... it runs in closed loop though and over 95% of the time runs totally fine __________________ My current Ecotec project... My last Ecotec project...