have code p0401 restricted flow egr. cleaned egr ,diaphragm works good ,used wd and lite air blow on modulator , used wd lube on vacuum switch valve . check engine lite back after 110 miles . any help
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1999 Toyota camry 2.2 engine auto /ac moved vsv valve to end of phellum for accessibility , had small bolt hole rite behind oil fill cap on phellum . Makes for good accessibility
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99% of the time p0401 is caused by the vacuum switching valve. Yes it could be a modulator,erg valve or restricted passages. Even ECM or wire harness. Trust me on the 99%
