#exhaust
5 posts in Car Diagnostics blog about "exhaust" — OBD-II diagnostics, DTC codes, repair. ← All posts
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Bang on lift-off: exhaust backfire and what it means
A pop from the exhaust when you lift off is either an aftermarket calibration doing it deliberately or unburnt fuel reaching a hot catalyst. Those are very different.
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Rattling over bumps: how to find the loose part
Rattles are frustrating because they only happen while you are driving. A systematic bounce test in the driveway finds most of them in twenty minutes.
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Exhaust modifications: what breaks besides the sound
Removing a catalyst or particulate filter changes more than the noise. The consequences for sensors, codes, and the annual test.
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Rattling underneath: heat shield, mounting, or silencer
A metallic rattle at particular revs usually costs almost nothing to fix. How to tell a heat shield from a blown silencer, and why not to run it on.
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Catalytic Converter Theft: OBD-II Detection and Prevention Guide
How to detect catalytic converter theft via OBD-II: P0420/P0430 after theft, misfires, exhaust noise — plus practical prevention, marking, and insurance advice.