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Toyota Repair/'98 Camry CEL

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Expert: Ted Ritter - 7/7/2009


Question
Hi Ted, a friend of mine has a 1998 Camry, 4 cyl 2.2L, and the check engine light has given me a P0401 code (Insufficient EGR Flow).  Without taking anything apart (yet), the EGR seems fine on inspection, it moves with slight pressure and returns to place, vacuum hoses on top seem fine.  I've read other causes for this code may be EGR position sensor (I beleive on top of the EGR valve???) or a DPFE sensor (big question mark on this one).  My question would be what approach to take to correct this code, and what/where is the DPFE sensor.  Your help would be appreciated, thanks!!

Answer
The 4 cylinder engine doesn't have a position sensor, the most common cause for this code is the egr modulator valve located directly on the egr valve, in most cases replacing the modulator and the egr vacuum switching valve takes care of the problem.

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Ted Ritter

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I have more than 28 years experience as toyota technician, I will be able to answer most questions related to the Toyota product line up to the present year models,I am located in the US but welcome questions from other regions of the world. When asking a question please provide specific information: year,model, engine,transmission information. Provide as much information as possible including a brief repair history if possible. I have been a volunteer here for almost ten years an have answered over 16,000 questions helping Toyota owners with their problems without any compensation, some of my answers are published on many other websites via google and other search engines. AllExperts recently added a new feature which allows questioners to donate to experts on the site, any amount of donation is very much appreciated, to make a donation just click on the DONATE button.

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Toyota technician since 1979,expert in electrical systems,OBD systems,engine repair, driveability problems,EFI systems,ASE certified,Toyota master technician.
Certified Hybrid Vehicle technician.

Education/Credentials
Toyota master technician, ASE certified in eight catagories, Hybrid vehicle certified. Toyota technical training: Engine Automatic transmission Manual transmission Drivetrain Electrical systems Brakes and chassis Air conditioning Engine performance and diagnostics Hybrid systems

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