P0421Catalyst efficiency below threshold
P0421 · Manufacturer wording
A listed vehicle is a research lead. Confirm the engine, production range and software in the manufacturer's information.
P0421 ← What does this code mean?5 Results
P0421-00CATALYTIC CONVERTER SYSTEM
P0421Catalyst 1 Efficiency Below Threshold Bank 1
NHTSA 10139942 ↗ NHTSA 10140028 ↗ NHTSA 10141275 ↗ NHTSA 10188824 ↗ NHTSA 10218256 ↗ NHTSA 10220620 ↗ NHTSA 10223808 ↗ NHTSA 10224951 ↗ NHTSA 10228110 ↗ NHTSA 10230344 ↗
P0421Catalyst 1 Efficiency Below Threshold Bank 1.** ·
P0421-00Catalyst 1 Efficiency Below Threshold Bank 1