Car should have been fit for purpose if bought from a dealer, which since the purpose of a vehicle is to travel on the road, it must be roadworthy as a minimum. The failed wiper and engine management fault make the vehicle unroadworthy, so you could push for a refund. However, this may be more inconvenient than just fixing the faults.
As for fixing the faults, you need the code reader to determine the fault causing the Engine Management Light issue. I would do this as a priority because the fault could be something so severe that it's not worth fixing, in which case, reject the car. Next up is those wipers. I found the Wipex linkages to be unsatisfactory, failing after just 2 years when the original linkage had held up for 7 years before that. I'd much rather spend £50 now on a complete wiper assembly (price based on shop4parts using FiatForum discount) than £26.50 on the Wipex linkages that are likely to fail again in the lifetime of the car, despite being safety-critical kit. Now Wipex will replace the linkages free of charge, but for an extra £23.50, I'd rather the peace-of-mind. Also, wiper judder is caused by the arm bushing elongating with wear, which gets replaced too when you buy the full motor kit.
