Exhaust Heat Exchanger Exhaust Bypass Valve A Stuck Open

Common symptoms

What you'll notice

• Inspect the exhaust heat exchanger for any signs of damage or leaks and repair or replace if necessary.
• Check the exhaust bypass valve for any obstruction or malfunction and clear or repair as needed.
• Clean and lubricate the exhaust bypass valve to ensure smooth operation.
• Adjust the settings or controls of the exhaust bypass valve to correct any misalignment or incorrect positioning.

Common causes

Most likely first

1. Clogged or restricted exhaust system
2. Faulty or malfunctioning exhaust heat exchanger
3. Stuck open exhaust bypass valve
4. Incorrect air/fuel mixture
5. Faulty oxygen sensor

How to diagnose & fix

Work through it in order

1. Decreased engine performance or power
2. Loud or unusual exhaust noise
3. Fuel efficiency decreases
4. Engine misfires or stalls
5. Increased exhaust emissions