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In the photo in Step 7 showing the Scratch (mBlock) code for navigating the car using the Up/Down/Left/Right Arrow keys, seems to have a bug which should prevent the right arrow key from working. Look at the fourth If/Else block. It says that when a 'down arrow' occurs (which already was processed by the second If/Else block of code) to drive the two motors the opposite direction as was done for the 'left arrow'. Assuming the 'left arrow' code is working, then the car should turn right if you reverse the voltages as compared to the left arrow code.

So I suspect the bug is the that this fourth If/Else block should looking for the IR Remote condition where the right arrow is being pressed, not the down arrow!