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The cost to diagnose the P0302 TOYOTA code is 10 hour of labor The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type Most auto repair shops charge between $75 and $150 per hour1 Answer Re Toyota Corolla 1999 code p0301 Were your plugs oily when you took them out?The reason very often is leaking valve cover gasket If the gasket is leaking even slightly in the plugs cavities, the oil will ground the spark plug shorting the circuit and throwing misfire codeP0301 TOYOTA code tech notes The P0301 code means that the cylinder 1 is misfiring or is randomly misfiring Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 1 If the problem persists more tests needs to be done to diagnose the problem, see Possible Causes P0302 Cylinder 2 Misfire Detected Toyota engine code p0301