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WALKER® EXHAUST SYSTEMS: Diagnosing Converter Issues
Catalytic converters can only function efficiently if the engine is operating properly, and the exhaust system is leak-free. Diagnose the cause of emissions problems with 13 key steps.
WALKER® EXHAUST SYSTEMS: Obtain Vehicle History
WALKER® EXHAUST SYSTEMS: Obtain Vehicle History
Customer feedback is an invaluable tool. Driveability, performance and service history can help guide you through the diagnostic process.

WALKER® EXHAUST SYSTEMS: Correct Other Engine Codes
WALKER® EXHAUST SYSTEMS: Correct Other Engine Codes
Any condition that increases emissions or affects sensor readings could cause a converter to fail diagnostics even if the converter is good.

WALKER® EXHAUST SYSTEMS: Correct Exhaust System Leaks
WALKER® EXHAUST SYSTEMS: Correct Exhaust System Leaks
Leaks in the exhaust system can affect O2 (Oxygen) storage in the converter and lead to improper O2 (Oxygen) Sensor readings, affecting the AFR (Air / Fuel Ratio) balance.

WALKER® EXHAUST SYSTEMS: Check Converter Temperature
WALKER® EXHAUST SYSTEMS: Check Converter Temperature
An infrared thermometer can be used to check the temperature of a converter to determine converter lite off.

WALKER® EXHAUST SYSTEMS: Backpressure
WALKER® EXHAUST SYSTEMS: Backpressure
Excessive system backpressure can generate a converter efficiency code.

WALKER® EXHAUST SYSTEMS: Check O2 (Oxygen) Sensor
WALKER® EXHAUST SYSTEMS: Check O2 (Oxygen) Sensor
O2 (Oxygen) Sensors are critical to fuel control and to the PCM's converter diagnostics.

WALKER® EXHAUST SYSTEMS: Cooling System
WALKER® EXHAUST SYSTEMS: Cooling System
Internal cooling system leaks can destroy a catalytic converter.

WALKER® EXHAUST SYSTEMS: Fuel System
WALKER® EXHAUST SYSTEMS: Fuel System
There are many things in the fuel system that can damage a catalytic converter or increase HC (Hydrocarbon) emissions.

WALKER® EXHAUST SYSTEMS: Fuel Trim – AFR (Air / Fuel Ratio)
WALKER® EXHAUST SYSTEMS: Fuel Trim – AFR (Air / Fuel Ratio)
The PCM attempts to maintain AFR of 14.7 : 1, using data it receives from the vehicle's sensors, primarily the MAF and O2 Sensors.

WALKER® EXHAUST SYSTEMS: Check Emissions Using Gas Analyzer
WALKER® EXHAUST SYSTEMS: Check Emissions Using Gas Analyzer
One of the most effective ways to resolve emissions issues is by sampling the exhaust gases.

WALKER® EXHAUST SYSTEMS: Cylinder Balance
WALKER® EXHAUST SYSTEMS: Cylinder Balance
Any cylinder that is not working as hard as the others is the most likely cause of emissions issues.

WALKER® EXHAUST SYSTEMS: Mechanical Condition
WALKER® EXHAUST SYSTEMS: Mechanical Condition
High-mileage engines can have many mechanical problems that contribute to high emissions.

WALKER® EXHAUST SYSTEMS: PCM Re-Flash
WALKER® EXHAUST SYSTEMS: PCM Re-Flash
Re-flashing is the process of updating the PCM (Powertrain Control Module) with the latest program available from the vehicle's manufacturer.