Powertrain
generic / SAE
P0430
Catalyst System Efficiency Below Threshold (Bank 2)
Same condition as P0420 but on bank 2. On engines with one shared catalyst per bank, P0420 and P0430 appearing together usually point to age rather than damage.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / 30
Possible causes
- Catalyst aged or contaminated high
- Downstream oxygen sensor drift medium
Symptoms
- Check engine light on
- Failed emissions inspection
- Possibly slightly increased fuel consumption
- Sulfur (rotten egg) smell from exhaust under load
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
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References
sae:J2012