Severity: Fix within days. Drive with caution and watch for new symptoms.
The computer commanded the EGR valve to send exhaust gas back into the engine to lower combustion temperatures, but the flow it measured was too low.
Clean the EGR valve and passages of carbon buildup, test the valve, and replace it if it does not open.
You may hear knocking under load and the engine may run hot. Drivable with care, but fix it soon.
You can drive short distances carefully; watch for worsening symptoms. You may hear knocking under load and the engine may run hot. Drivable with care, but fix it soon.
The most common causes are: Clogged EGR passages; Stuck-closed EGR valve; Failed EGR position sensor; Vacuum leak in the EGR control line; Carbon buildup in the intake. A scan tool and a visual check of the parts above is where a technician starts.
Clean the EGR valve and passages of carbon buildup, test the valve, and replace it if it does not open.
