P0420 – Land Rover DTC

Land Rover DTC P0420 – Catalyst Efficiency Low Fault Bank A

DTC P0420 meaning on Land Rover

1. DTC P0420 indicates that the catalyst system efficiency for Bank A is below the threshold.
2. It means that the catalytic converter is not performing as expected in reducing emissions.

Land Rover DTC P0420 symptoms

• Check Engine Light (CEL) illuminated on the dashboard.
• Reduced fuel efficiency.
• Decreased engine performance.

Land Rover DTC P0420 causes

• Failed catalytic converter.
• Oxygen sensor malfunction.
• Exhaust leaks.
• Engine misfire.

Land Rover DTC P0420 seriousness

1. If left unresolved, it can lead to increased emissions and potential damage to other components.
2. Continued driving with this fault may result in the vehicle failing emissions tests.

How to diagnose DTC P0420 on Land Rover

1. Use an OBD-II scanner to retrieve the fault code and check freeze frame data.
2. Inspect the catalytic converter for physical damage or clogging.
3. Check the oxygen sensor readings for Bank A to ensure proper operation.

How to fix DTC P0420 on Land Rover

1. Replace the catalytic converter if it is confirmed to be faulty.
2. Repair any exhaust leaks that may be affecting the efficiency of the catalytic converter.
3. Replace the oxygen sensor if it is not functioning correctly.

How to erase DTC P0420 on Land Rover

1. After fixing the underlying issue, use an OBD-II scanner to clear the fault code.
2. Ensure that the Check Engine Light is no longer illuminated after clearing the code.