P0430 on a Toyota RAV4
P0430 means catalyst System Efficiency Below Threshold (Bank 2). On the RAV4, a few causes come up far more than others.
What P0430 usually means on a RAV4
P0430 only shows up on V6 RAV4s, since the fours have a single exhaust bank. It signals that the bank 2 (rear) catalytic converter has fallen below the efficiency the ECU expects. As with the front-bank P0420, it's normally an aging original converter or a slow rear O2 sensor rather than a sudden failure. The rear converter sits against the firewall, which makes it the harder of the two to diagnose and service.
Most common causes on the RAV4
- Worn bank 2 converter
The V6 RAV4's rear cat loses efficiency with age and heat cycles just like the front.
- Aged bank 2 O2 sensor
The firewall-side rear sensor is often original and slows down, imitating a bad cat.
- Rear exhaust leak
Corroded rear manifold or pipe joints pull in air and distort the reading.
- Oil or coolant fouling
A weeping 2GR-FE valve cover or timing cover can contaminate the rear cat over time.
- Unaddressed rear-bank misfire
A weak coil on the rear cylinders pushes fuel into the rear cat and sets P0430.
What P0430 costs to fix on a RAV4
The rear converter on the V6 RAV4 is the pricier one because access is tight against the firewall, adding labor. Part cost is similar to the front cat, a few hundred dollars for a good direct-fit. Verify the rear O2 sensor's waveform first, since a sensor costs a fraction of a converter.
Year, engine and mileage change the answer. Start a case and Redline weighs these causes against what your car shows, then names the check that would settle it.
Other codes on the Toyota RAV4
Related symptoms
Toyota RAV4 problems & recalls by year
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.
P0430 on your RAV4?
Every problem becomes a Case. Tell Redline what your RAV4 is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.