#catalytic converter
7 posts in Car Diagnostics blog about "catalytic converter" — OBD-II diagnostics, DTC codes, repair. ← All posts
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Buying a car with LPG: what to check besides the gas equipment itself
Everyone inspects the gas system. Few check what it did to the engine over a hundred thousand kilometres — and that is where the difference between a good buy and an expensive repair lives.
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Plug-in hybrids: the hardest type of car to diagnose
Here you have everything at once: a combustion engine with a full emissions system plus a high-voltage drivetrain. And each half suffers because the other keeps working in its place.
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Check Engine flashing vs steady: the difference that decides whether you keep driving
A steady lamp says "book a diagnostic soon". A flashing lamp says "stop now". They are two distinct signals from one indicator, and confusing them costs a catalytic converter.
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P0135 and P0141: oxygen sensor heater — the code often cured by a fuse
An oxygen sensor does not work until it reaches 570 °F, so it carries its own heater — and the heater is what fails first. Why this does not always mean replacing the sensor.
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Secondary air injection P0410: runs 90 seconds a day and fails anyway
A pump that only runs on a cold start, and only for a minute and a half. It sits idle the rest of the time — which is precisely why it corrodes, seizes, and eventually produces a code that fails your emissions test.
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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.
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P0420: Why the Catalytic Converter "Fails"
A detailed breakdown of code P0420: what "catalyst efficiency below threshold" means, common causes, how to diagnose it, repair costs, and whether you can keep driving.