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P0401 Diagnostic Trouble Code Discussion for July 2005

Insufficient EGR Flow Detected *

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Trouble Ticket Help Requests for DTC P0401

	Help Request	Posted
	1999 Toyota Camry CE 2.2L MIL Lamp on VIN: 4T1BG22K20 P0401: EGR System Insufficient Flow Detected. PO401 setting all the time. EGR valve will cause engine to stumble terribly when actuated with vacuum pump(exhaust ports and intake ports OK). Valve can be seen opening when power braking engine(Vacuum hoses and switches working). No other codes are set and no...	July 25, 2005
	2000 Toyota Camry CE 2.2L MIL Lamp on VIN: JT2BG22K9Y P0401: EGR System Insufficient Flow Detected. i have a 2000 camry 4cyl with a code p0401 egr low flow, found valve intermittently opening. replace vsv and vac. modulator, valve now operates normally but was still coding p0401. replaced ecu for misfire update no change, replaced with different map sensor a...	July 25, 2005
	2000 Toyota Camry CE 2.2L MIL Lamp on VIN: 4T1BG22K6Y P0401: EGR System Insufficient Flow Detected. ... Toyota Camry came in with the mil light on and a code P0401 stored.I check over the system according to Mitchell On Demand.The EGR value, opens and will stall the motor, also holds vacuum. Modulator,Passes all the vacuum tests. VSV tests good and is not cl...	July 26, 2005