P1420 Honda Code - NOx Adsorptive Catalyst System Efficiency Below Threshold
Quick Answer
The P1420 Honda code indicates that the NOx Adsorptive Catalyst System's efficiency is below the threshold set by the vehicle's engine control module. Common causes include Malfunctioning NOx Adsorptive Catalyst, Faulty oxygen sensor, Damaged catalytic converter. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1420 Honda indicates NOx Adsorptive Catalyst System Efficiency Below Threshold.
- Common causes
- Common causes include Malfunctioning NOx Adsorptive Catalyst, Faulty oxygen sensor, Damaged catalytic converter.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P1420 Honda Description
The P1420 Honda code indicates that the NOx Adsorptive Catalyst System's efficiency is below the threshold set by the vehicle's engine control module. NOx, or nitrogen oxides, are pollutants emitted from the vehicle's exhaust system. The NOx Adsorptive Catalyst is designed to reduce the amount of NOx released into the atmosphere by converting it into less harmful gases. When the efficiency of this system falls below the specified threshold, it can lead to increased emissions of NOx, which can be harmful to the environment and may also cause the vehicle to fail emissions tests.
Common Causes of P1420 Honda
- Malfunctioning NOx Adsorptive Catalyst
- Faulty oxygen sensor
- Damaged catalytic converter
- Issues with the engine control module
- Exhaust system leak
Symptoms of P1420 Honda
- Check engine light is illuminated on the dashboard
- Decreased fuel efficiency
- Reduced engine power
- Failed emissions test
- Strong smell of exhaust fumes
How to Fix P1420 Honda
- Diagnose the specific cause of the issue using a scan tool to retrieve the fault codes and inspecting the NOx Adsorptive Catalyst system components.
- Replace the faulty NOx Adsorptive Catalyst, oxygen sensor, or catalytic converter as needed.
- Repair any leaks in the exhaust system and ensure all connections are secure.
- Clear the fault codes from the engine control module and perform a test drive to verify the repair.
- If the issue persists, further diagnostic testing may be required to identify any underlying issues with the engine control module or other components.
Cost to Fix P1420 Honda
The typical repair costs for addressing a P1420 Honda code can vary depending on the specific cause of the issue and the parts and labor required for the repair. In general, the cost of replacing a faulty NOx Adsorptive Catalyst, oxygen sensor, or catalytic converter can range from $200 to $1000 or more. Labor costs for this repair can vary between $80 and $150 per hour, depending on the location and the auto repair shop. It's advisable to obtain a detailed estimate from a qualified mechanic to determine the exact cost of resolving this issue for your specific vehicle.
Tech Notes for P1420 Honda
2003–2005 Honda Civic Hybrid ULEV (KA)
2002–2006 Honda Insight With M/T
Honda Civic, Insight Factory Service Bulletin OBDII Code P1420
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