My 2000 Saturn LW2 starts hard shifting after city driving about 16 kms. If I turn the engine off for one minute and start the car the hard shifting stops and I can drive another 10 kms before the hard shifting starts again.

It threw the codes P0405 and P0030 Bank 1 Sensor 1. I changed the EGR the P0405 code (Exhaust Gas Recirculation Sensor) and the trouble light continued to come on and the hard shifting continued after about 16 kms.

I changed the Oxygen Sensor the P0030 and the trouble light still comes on after 16 kms however now if I 'rapid' accelerate the trouble light comes on a bit sooner and hard shifting returns.

The only thing I can think of is that the Saturn requires an OEM Oxygen Sensor and not an After Market Oxygen Sensor? Or the heat of the engine has damaged the wiring harness? Anyone have a solution to fix this and stop the hard shifting?