I got a service engine soon light..When I told Dealer light when out service mgr. said don't bring it in, problem has corrected itself. Light comes back on..of course light out by appointment time...I told them I knew code was still in computer...diagnois..
Code P1127, Catalyst sensors inop due to aftermarket converters, they can't fix. They said no code on O2 sensors
I feel like I've been fed snake oil?

Does anyone have the text for SB 99147 (Codes for Star Testers)? / or know what P1127 code is?
Final question, With this code in computer, does computer reduce performance?
Thanks, Jim

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99 lightning
red,snuglid
PSP Chip & Filter
12.930 106.1 best
bassini
build date 4/14/99
NLOC # 362