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Old 12-14-2009, 01:32 AM   #18
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Cover as far as what? An emissions test? Yes, and no.

For OBDII cars they don't use a sniffer at all. All they do is plug a basic scantool into the OBDII data link port and check for readiness parameters and emissions related codes. If the car is throwing a code, you fail the test. Technically you could have no cat on the car and pass as long as it isn't throwing a code.

Now putting a header on will always make your car throw a code because of the downstream O2 sensor. You can either get a tune to disable this sensor, or use an O2 cheater to pass.
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