abs light stays on and oil pressure light stays on on 1996 Pontiac Grand Am

mechanic got codes po33 po31 4145 po91 po92 told i needed senser on passenger side replaced light it stays on.car has no problem braking cars has great acceleration and power why oil light pump gas petal while off light stays off for a while then comesback on

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1 answer
Need a better discription, exact code numbers. They are four digit with the P, for instance, P0301, P1870. These cars are known for dash light problems, communication problems between the module's.