P0430 on a Toyota Camry
P0430 means catalyst System Efficiency Below Threshold (Bank 2). On the Camry, a few causes come up far more than others.
What P0430 usually means on a Camry
P0430 only appears on V6 Camrys, since the four-cylinders have a single bank. It means the bank 2 (rear) catalytic converter has dropped below the efficiency the ECU expects. Like its bank 1 twin P0420, it's usually a slowly aging original converter or a tired downstream sensor rather than a sudden failure. Because bank 2 hides against the firewall, both diagnosis and repair are more awkward than on the front bank.
Most common causes on the Camry
- Worn bank 2 catalytic converter
High-mileage 2GR-FE Camrys lose rear-bank cat efficiency just like the front; heat cycles and age are enough.
- Aged bank 2 downstream O2 sensor
The rear sensor is harder to reach on the firewall side and often original, and a slow one imitates a bad cat.
- Exhaust leak on the rear bank
Rusted rear manifold or pipe joints pull in air and skew the reading.
- Oil or coolant contamination
A weeping 2GR-FE valve cover or timing cover can foul the rear cat over time.
- Unresolved rear-bank misfire
A weak coil on cylinders 2, 4, or 6 dumps fuel into the rear cat and trips P0430.
What P0430 costs to fix on a Camry
Bank 2 work on the 2GR-FE is the pricier of the two converters because access is tight against the firewall, which adds labor time. Parts pricing mirrors the front cat — a few hundred dollars for a quality direct-fit. Confirm with a rear-sensor waveform before replacing anything, since a sensor is far cheaper than 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 Camry
Related symptoms
Toyota Camry 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 Camry?
Every problem becomes a Case. Tell Redline what your Camry 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.