This EGR checking/repair was perform at the Rav4 Toyota 1998.
Toyota Engine Code – EGR P0401 –
Camry, Tercel, 4 Runner, Celica,
Paseo, Tacoma, Rav4 1996 to 2005
How to fix/diagnose Code P0401 Toyota – EGR Valve, Vacuum Modulator, Vacuum Switch Valve DIY
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How much vacuum should be at R and P and at what RPM?