2026-09-15
Lexus IS 250/300h/350 Catalytic Converter Replacement Malaysia
The IS 250/350 V6 has two catalytic converters (one per bank). Clogging is rare before 150,000 km but can occur if the engine burns oil or runs rich. Symptoms: reduced power, rotten egg smell, failed emissions check. OEM Catalytic converter theft is not a widespread issue in Malaysia for IS-sized cars.
Lexus IS Catalytic Converter
- IS uses close-coupled catalytic converters (directly on exhaust manifold) for fast warm-up and low emissions — EPA Tier 2 and Euro 5/6 compliant
- IS catalytic converter lifespan: typically 150,000–200,000 km on good engine; premature failure caused by oil burning (worn rings/valve seals) or misfires coating catalyst with raw fuel
- IS P0420/P0430 codes: catalytic efficiency below threshold — confirm with Techstream O2 sensor live data; if upstream and downstream sensors show same wavefo catalyst is spent
- IS aftermarket cat: if replacing, use CARB-compliant catalytic converter — direct-fit OEM or quality aftermarket avoids re-triggering CEL; avoid hollow-core cats that trigger codes immediately