No check engine light, car starts and runs fine until it warms up then limp mode. Camshaft sensor, plugs and wires? The car has 66000 miles. There is no oil in plugs from leaking head gasket.The last thing done to car was replace serpentine belt.
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didnt specify vehicle --generic answer--until repair is made the vehicle will show engine light and have codes --if gearbox is problem for limp mode /until repairs are made or gearbox replaced you will be in limp mode --and as to sensor find out what one it was --start problem may show back up if sensor was problem --and GET a 3rd opinion you have 2 mechanics with different opinions on your problem and i guess they are reading your trouble codes differently
Is the vehicle's Check Engine Light on? It should briefly light up when you turn the key on (before you start the engine) to show that the light is working correctly. Based on what I've read I believe you should have one or more trouble codes. A place like AutoZone will read the trouble codes for you for free, and you can look them up here - http://www.engine-light-help.com/generic-check-engine-light-codes.html
Code 24 is a vehicle speed signal sensor fault, the sensor most likely does not provide a useable signal until about 25 MPH, when the computer doesn't see any signal after that speed it turns on the light. Make sense?