Error code P0401 on a 2004 Ford Focus indicates EGR Insufficient Flow, which usually means your DPFE sensor needs to be replaced. If you're not sure though, and you shouldn't be, watch this video to learn how to perform a test that will make sure your DPFE sensor is actually broken before you replace it.
Just updated your iPhone to iOS 18? You'll find a ton of hot new features for some of your most-used Apple apps. Dive in and see for yourself:
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Open Your Car Door Without a Key: 6 Easy Ways to Get in When Locked Out
How To:
Locate and replace the CPS in a Saturn S-Series car
How To:
Fix error code P0171 on a 2000 Ford Escort
How to Fix Car Dents:
8 Easy Ways to Remove Dents Yourself Without Ruining the Paint
How To:
Unlock a Car Door Using a Cell Phone and a Faraway Keyless Remote (Faux-To?)
How To:
Fix a Huge Dent in Your Car at Home Without Ruining the Paint Job
How To:
Repair Vehicle Dents Using a Hammer and Dolly
How To:
Use Lysol to Clean Bacteria Out of Your Car's Air Conditioning System
How To:
Use a shortcut to quickly remove a heater core on a 2001 Ford Taurus
How To:
Replace the Front Inside Door Handle on a 04-10 Toyota Sienna
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Replace the fuel filter in a Saturn S-Series car
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Replace a 2009 Ford Focus brake, backup, or tail light bulb
How To:
Remove the blower motor resistor in a Saturn S-Series
Boiled Water:
The Easiest Way to Remove Dents from a Car Bumper
How To:
Stop Running Over Plastic Bags! And More Small Tips for Keeping Your Car Running Smoothly
How To:
Replace Headlight Bulb on Pontiac G6
How To:
Remove the Door Panel from a 2002 Ford Explorer
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Fix error codes P0340 & P0341 on a Saturn S-Series
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