What does code P0430 mean on a Mercedes-Benz and is it safe to drive?
P0430: Catalyst System Efficiency Below Threshold (Bank 2). Here's what it means on your Mercedes-Benz, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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What this code means
Same as P0420 but for bank 2. The catalytic converter on bank 2 is not operating efficiently.
Common causes for your Mercedes-Benz
- Failed catalytic converter (bank 2)
- Faulty O2 sensor(s)
- Exhaust leak
Symptoms
- Check Engine Light
- May fail emissions
Typical fixes
- Replace bank 2 catalytic converter
- Replace oxygen sensors
- Repair exhaust leaks
Repair cost range
For a Mercedes-Benz, repairs for P0430 often fall between $400 and $2400, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Mercedes-Benz
Mercedes P0430 on M272 V6 and M273 V8 engines targets the bank 2 (passenger-side) catalyst. Both catalysts typically degrade at similar rates; if P0420 and P0430 appear together, test the rear O2 sensors first before budgeting for both converters.
Most commonly affected models
E350/E500 2007–2013ML350/ML500 2006–2011S550 2007–2013