Haynes Manual says:
a) Connect a vacuum gauge to an intake manifold vacuum source.
b) Warm the engine to operating temp.
c) Note and record the vacuum reading at idle.
d) Open throttle until the engine speed is about 2000rpm.
e) Release the throttle and quickly record the vacuum...
My Haynes manual says:
P0420 = Catalyst system efficiency below threshold, left bank
P1345 = Crank shaft position sensor/Camshaft position sensor correlation
P0430 = Catalyst system efficiency below threshold, right bank
Hope this helps!
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