OBD codes / P0430 / Toyota Tacoma
P0430 on a Toyota Tacoma
Catalyst System Efficiency Below Threshold (Bank 2)
4.0L 1GR-FE V6 and 3.5L 2GR-FKS V6; bank 2 is the second cylinder bank.
What P0430 usually means on a Tacoma
P0430 appears only on V6 Tacomas, flagging the bank 2 catalytic converter as below the efficiency the ECU expects. Like the bank 1 P0420, it's usually an aging original converter or a slow rear O2 sensor rather than a sudden fault. On these trucks it tends to arrive at high mileage after years of heat cycling. The check-engine light is steady with no obvious drivability change.
Most likely causes on this model
- Worn bank 2 converter
The V6 Tacoma's second-bank cat loses efficiency with age just like the first.
- Aged bank 2 O2 sensor
A slow rear Denso sensor on that bank can mimic a failing cat.
- Exhaust leak on bank 2
Rust-belt Tacomas develop leaks at manifold and pipe joints that skew the reading.
- Unaddressed bank 2 misfire
A weak coil on that bank pushes fuel into the cat and trips P0430.
What it costs on a Tacoma
Bank 2 converter work on the Tacoma V6 is comparable to bank 1 in part cost but can be tighter to access depending on the exhaust routing. Confirm the rear O2 sensor's readings first, since a sensor is far cheaper than a converter. With converter theft common on trucks, verify you actually have a worn cat and not a stolen or damaged one.
Year, engine and mileage change the answer. Get a diagnosis for your Tacoma — it weighs these causes against your exact configuration and real complaint data.
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Based on widely reported patterns for this model; individual causes vary by year, engine and history. Generic P0430 behavior is covered on the main P0430 page. Confirm with a scan tool before buying parts.