has anybody experienced this?
i took out my cat-converter and replaced it with a test pipe and now the check engine light comes on as well as the ATTS light?
what does this mean, the ATTS is not working?
or the light is just on?
When you removed the cat you basically are telling the secondary O2 sensor that your cat isn't doing it's job which switches on the check engine light, which in turn turns off ATTS.
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