im also experiencing the same problem with my car which is 1997 honda civic vti! in not so distant past it had its two sensors,ive forgotten there names, changed,out of which one was repaired actually on his insistence. those sensors were changed by him after getting on the underside of the engine and doing something near the left front tyre,if that makes any sense!
so should i suspect that the mechanic did something with its timing chain if it has any? or its the same issue of the oil pump getting a bit wider or something!
will be grateful for guidance!