| I've never had any experience with the air problems you mentioned, but here are a couple things to check in regards to having PS than losing it: Is your speedometer working? Steering assist and hicas use speed in their decision making...If no speedo, PS will work when the car is first started, then go away quickly. It also produces the HICAS light. Cause can be a bad speed sensor or wiring problem. Mine was a pinched wire. Check the pressure switch in the PS line. Sometimes it goes bad; more often has a bad or broken connection. Can also be intermittent. PS would be completely gone, or completely random.
------------------ Tada! "Low compression in cylinder 6." 
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