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I just purchased a 1992 LS 400. Car drive great for a few days then began to accelerate slowly up hill. Read the codes came up with 21 Main O2 Sensor left bank / 25 Air Fuel Lean Malfunction / 41 Throttle Position Sensor Signal / 71 EGR System Malfunction / I'm new to the world of Lexus and I love the car. Can anyone help. Thanks In Advance Ajg2business.