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Thread: How Do I disable Cat-Diagnostic on 02 GTP sedan with HPT-Pro??

  1. 10-03-2016 #1
    97AutoXVette
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    How Do I disable Cat-Diagnostic on 02 GTP sedan with HPT-Pro??

    I have a 2002 GTP sedan with many mods that I have installed including catless downpipe and rear-O2 sensor Delete. There have been threads in the past about how HP-Tuners cannot disable the CAT O2 diagnostics from running even with the "MIL/SES" codes and CEL triggers disabled..

    Does anyone know if there is a way to do this now? I have HP-Tuners Pro and I want to prevent the ECU from running this check as I am continually dropping pulley sizes and the fuel-enrichment condition that occurs during this check is generating some engine knock even at lower throttle conditions due to how much fuel is being added.

    Thanks in advance!
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  2. 10-03-2016 #2
    5FDP
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    Can't shut it off with HPT, only DHP can.

    Installing the the rear o2 with a long spacer to keep it out of the exhaust system is the other option.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.
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  3. 10-03-2016 #3
    97AutoXVette
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    Darn!!!! I was hoping there would be a "cure" for this by now.. appreciate the info
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