Exhaust Heat Exchanger Exhaust Bypass Valve A Stuck Closed

Common symptoms

What you'll notice

• Check for any blockages or restrictions in the exhaust system and clean or replace as necessary.
• Inspect and potentially replace the exhaust bypass valve if it is malfunctioning or stuck closed.
• Verify and ensure that the exhaust heat exchanger is functioning properly and repair or replace if needed.
• Check and adjust the settings of the exhaust bypass valve to ensure it is not stuck closed and allowing proper exhaust flow.

Common causes

Most likely first

1. Clogged or restricted exhaust pipe or catalytic converter
2. Faulty or malfunctioning oxygen sensor
3. Engine misfire or mechanical issue
4. Faulty or malfunctioning EGR valve
5. Issues with the fuel system, such as a clogged fuel injector or insufficient fuel pressure

How to diagnose & fix

Work through it in order

1. Engine misfire or rough idle
2. Decreased engine power or acceleration
3. Check Engine Light (CEL) illuminated
4. Increased exhaust emissions or strong exhaust odor
5. Difficulty starting the vehicle or stalling