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P1128 & P1130

Engine

Model: Boxster, Year:2000, Mileage:30000, Type of use:Street use only
Replaced the two pre-cat 02 sensors with Bosch. The check engine light went out after a few months. I thought the problem was solved but just failed emissions. Turns out the check engine light now does not work at all and the old P1128 code is still in the computer along with a new P1130 code. I don't know that the cycle has run all the way through the catalytic converter either. I'm told that only a dealer will have the proper computer(s) to check, reset, activate anything. Tips ?

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