P0420 — Catalyst System Efficiency Below Threshold (Bank 1)

Powertrain (engine/transmission)

Catalyst System Efficiency Below Threshold (Bank 1)

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Can I drive with P0420?

Drive as little as possible and book an inspection promptly.

Common symptoms with P0420

• Engine runs rough

Full symptom matching, likelihood scoring and related codes for your specific vehicle require a diagnosis.

Frequently asked questions

What does fault code P0420 mean?

P0420 means Catalyst System Efficiency Below Threshold (Bank 1).

Can I keep driving with P0420?

Drive as little as possible and book an inspection promptly.

What symptoms are common with P0420?

Engine runs rough

Related fault codes

• P0421 — Warm Up Catalyst Efficiency Below Threshold (Bank 1)
• P0422 — Main Catalyst Efficiency Below Threshold (Bank 1)
• P0423 — Heated Catalyst Efficiency Below Threshold (Bank 1)
• P0424 — Heated Catalyst Temperature Below Threshold (Bank 1)
• P0425 — Catalyst Temperature Sensor (Bank 1, Sensor 1)
• P0426 — Catalyst Temperature Sensor Range/Performance (Bank 1, Sensor 1)
• P0427 — Catalyst Temperature Sensor Low Input (Bank 1, Sensor 1)
• P0428 — Catalyst Temperature Sensor High Input (Bank 1, Sensor 1)
• P0429 — Catalyst Heater Circuit (Bank 1)

Get a full diagnosis for P0420 with AutoUncover.