Quote:
Originally Posted by akkando
How do you know the tune isn't causing this?
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Previous owner smogged car with this tune last year. Also, the tests are showing "pass" but the actual monitor isn't coming ready. In the past with tunes that disable rear O2s, these specific O2 sensor $01-$87 tests will never show "passed".
Car is fully stock with all 4 cats and brand new O2 sensors, replacing TAs today as I've seen a few cases where monitors never show up as ready due to large throttle oscillations during the 55mph highway tests.