Can I drive with a bad catalytic converter?

You can usually drive with a failing catalytic converter, but it will cause a failed emissions test and may reduce performance. A completely clogged converter can cause overheating and stalling.

What causes a catalytic converter to fail?

Common causes include engine misfires, oil or coolant burning, running rich or lean for extended periods, physical damage, and normal aging after 100,000+ miles.

P2000

NOx Trap Efficiency Below Threshold (Bank 1)

Severecatalyst

Overview

The P2000 code signals that the PCM has detected a nox trap efficiency below threshold (bank 1) condition. This code relates to the catalytic converter or NOx trap, critical emissions components that convert harmful exhaust gases into less harmful substances. Reduced efficiency typically means the component is no longer adequately processing exhaust pollutants.

Symptoms

Sulfur or rotten egg smell from exhaust
Engine overheating due to clogged converter
Check Engine Light (MIL) illuminated
Poor fuel economy

Common Causes

Rich or lean fuel mixture over extended period
Aging or worn catalytic converter
Internal converter substrate failure
Faulty oxygen sensor providing incorrect readings

Diagnosis Steps

1Connect an OBD-II scanner and read all stored trouble codes and freeze frame data
2Monitor upstream and downstream O2 sensor readings; compare switching patterns
3Check for exhaust leaks before the catalytic converter
4Inspect for engine misfires or other codes that could damage the converter
5Test the catalytic converter efficiency using a temperature gun (inlet vs outlet)

Estimated Repair Cost

$200 — $2,500

Cost varies by vehicle, location, and repair shop. Includes parts and labor.

Commonly Affected Vehicles

Toyota CamryChevrolet EquinoxHonda AccordHonda CR-V

Related Codes

P2001 P0136 P0130

More Catalyst Codes

P0420Catalyst System Efficiency Below Threshold (Bank 1)

Moderate

P0421Warm Up Catalyst Efficiency Below Threshold (Bank 1)

Moderate

P0422Main Catalyst Efficiency Below Threshold (Bank 1)

Moderate

P0423Heated Catalyst Efficiency Below Threshold (Bank 1)

Moderate

P0424Heated Catalyst Temperature Below Threshold (Bank 1)

Moderate

P0425Catalyst Temperature Sensor (Bank 1 Sensor 1)

Low

Frequently Asked Questions

Catalytic converter replacement typically costs $500-$2,500 depending on the vehicle and converter type. OEM converters are more expensive but often provide better performance and longevity.