Catalyst efficiency Bank 2

Same catalyst-efficiency story on the other bank. Same rule: prove the brick, do not assume it. Do not replace both converters because one bank set a code.

Do not pair-replace converters from P0430. Graph Bank 2 only. A leak or a lazy sensor still wins.

DIY

Look, then stop

Same as P0420. Write the code. Do not buy two bricks.

Confirm it is P0430, not P0420. Bank 2 is the other exhaust path.
Do not authorize a 'both cats while we are in there' line from one bank.

Tools: Any $20 OBD-II scanner

In the aisle

What they will ask

The parts person does not start with a SKU. They start with the engine and whether it is 2WD or 4WD. Answer from the bay ticket when we have it.

Which engine?
They will ask — not on the hook yet
Bank 2 only exists on some layouts. An inline-four may not have a Bank 2 cat the way a V6 does.
Federal or California (CARB)?
They will ask — not on the hook yet
Wrong emissions family fails smog even if it bolts up.

Parts aisle

Boxes on the hook

Search for year / make / model not on the hook. Not stock. Not TecDoc.

Sensors · bin SENS-3

Upstream O2 (Bank 2)

Only if the Bank 2 graph is lazy.

Query: upstream oxygen sensor bank 2

Hold

Exhaust · bin HOLD

Catalytic converter (Bank 2)

HOLD. Same diagnose-first rule as P0420.

Query: catalytic converter bank 2

Related: P0420