P0434

Symptoms

• Increased fuel consumption
• Reduced engine power
• Check Engine light comes on
• Increased level of harmful emissions

Causes

• Malfunction of the catalytic converter
• Problems with temperature sensors
• Leaks in the exhaust system
• Engine management system malfunction
• Misfire or lean mixture

How to Fix

1. Check the integrity of the exhaust system for leaks
2. Diagnose the condition of the catalytic converter
3. Check the operation of temperature and oxygen sensors
4. Eliminate possible misfires or mixture problems
5. If necessary, replace the catalytic converter

Related codes

Error P0434 by Vehicle Brand