Code P0401Monitor
EGR Flow Insufficient Detected
Your emissions control system is clogged - like a blocked drain. Engine runs hotter and produces more pollution.
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Monitor and Maintain
This issue is not immediately critical but should be addressed at your next service.
Recommended Actions:
- •Note the code for your next service
- •Monitor for any changes in symptoms
- •Can combine with next scheduled maintenance
- •Check if code returns after clearing
What This Code Means
The exhaust gas recirculation (EGR) system is not flowing enough exhaust back into the engine.
"Your emissions control system is clogged - like a blocked drain. Engine runs hotter and produces more pollution."
Common Causes
Clogged EGR passages
Failed EGR valve
Carbon buildup in intake
Faulty EGR position sensor
Vacuum line problems
Symptoms You May Notice
Professional Diagnostic Steps
Our technicians will perform these checks:
Commonly Affects These Vehicles
Note: This code can appear in any vehicle. These are just the most common.
Repair Cost Breakdown
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Frequently Asked Questions About Code P0401
Can I keep driving with code P0401?
Safe to drive but may fail emissions test - repair when convenient
How much will it cost to fix P0401?
The repair approach depends on the specific cause and your vehicle.The most common cause (clogged egr passages) usually costs on the lower end of this range.
Will code P0401 clear itself?
While the check engine light may turn off if the condition improves temporarily, the code will remain stored in your vehicle's computer. The underlying issue still needs to be addressed to prevent the code from returning and potentially causing damage.
Is P0401 covered under warranty?
Many emissions-related repairs are covered under federal emissions warranty (8 years/80,000 miles for catalytic converters and ECM). Check with your dealer.
Don't Guess - Get Professional Diagnosis
Code P0401 can have multiple causes. Our diagnostic process ensures we fix the right problem the first time.