p0430
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Toyota · SUVs
Catalyst System Efficiency Below Threshold Bank 2
Quick Answer
Error code P0430 on your Toyota SUVs means: Catalyst System Efficiency Below Threshold Bank 2. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
4Runner TRD Pro 2024Grand Highlander Limited 2024Highlander XLE 2024Highlander Hybrid Bronze Edition 2023Land Cruiser 1958 Edition 2024RAV4 XLE Premium 2024RAV4 Hybrid SE 2024Sequoia Capstone 20244Runner Limited 20244Runner SR5 20244Runner TRD Off-Road 2024Grand Highlander Platinum 2024Grand Highlander XLE 2024Highlander LE 2024Highlander Limited 2024Highlander Platinum 2024RAV4 Adventure 2024RAV4 LE 2024RAV4 TRD Off-Road 2024RAV4 XLE 2024Sequoia Limited 2024Sequoia Platinum 2024Sequoia SR5 2024Sequoia TRD Pro 2024Venza Limited 2024
Likely Causes
How to Fix It
1
Verify no engine DTCs are present that could damage the Bank 2 catalyst
2
Monitor Bank 2 downstream O2 sensor readings for excessive switching indicating a failing converter
3
Inspect the Bank 2 exhaust manifold and pipes for leaks
4
Test catalyst efficiency by comparing inlet and outlet temperatures
5
Replace the Bank 2 catalytic converter if confirmed inefficient
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
Parts You May Need
Catalytic converter (Bank 2)
Downstream oxygen sensor (Bank 2 Sensor 2)
Exhaust manifold gasket
Exhaust pipe flange gasket
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