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P0430 Catalytic converter isn't working as well as it should (bank 2)

Generic SAE definitionCatalyst system efficiency below threshold (Bank 2)

Drive gentlyYou can drive it, but take it easy and get it looked at soon – waiting usually makes the repair bigger.

Check this first

Same as bank 1 – rule out the rear oxygen sensor and exhaust leaks before replacing anything.

What usually fixes it

In the order a good shop checks them. Typical total: $103–$2,206 at $130 an hour.

  1. Downstream oxygen sensor

    $128–$350

    The rear sensor is the cheaper and commoner cause.

  2. Exhaust leak

    $176–$494

    Air getting in near the sensor mimics a dead converter.

  3. Catalytic converter

    $510–$2,206

    Genuinely worn out, usually after a misfire went unfixed.

Code titles are the generic SAE definitions. Prices are typical US parts and labor for a common car or light truck – a guide for judging a quote, not a quote. Always confirm a repair against the vehicle in front of you.

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The Trouble codes screen in Drive DTC: stored, pending and permanent counts, then C0040-13 explained in plain English with what to check first, likely fixes in order and typical cost ranges

More in Emissions

All 12 codes in this group
P0401Exhaust gas recirculation flow insufficient detected P0420Catalyst system efficiency below threshold (Bank 1) P0441Evaporative emission system incorrect purge flow P0442Evaporative emission system leak detected (small leak) P0443Evaporative emission system purge control valve circuit P0446Evaporative emission system vent control circuit