Suspension Noise problems of the 2000 Nissan Maxima

I purchased a used 2000 Nissan Maxima that had 28,000 miles on it almost 3 years ago. I have only put 6,000 miles on the car, but have had problems with the check engine light being on almost continuously since I purchased the vehicle. I took it to my regular mechanic when it had to pass smog inspection. He temporarily fixed the engine light problem, but soon as I accelerated over 50 miles per hour, the light came on again. I have also had problems with the brakes, which had to be completely replaced twice, the ignition (car wouldn't start), and, a problem with the car when downshifting (engine seizes up violently). There is also a suspension problem, as car makes loud noise every time I have to go over speed bumps. My son is ready to get his driver's license, and I will have to get rid of this car at a loss, as I do not feel the car is safe for him to drive.

Transmission failure: bought vehicle in April of '99. Transmission began to slip at 15k. Reman trans under warranty. 2nd slip occurred at 30k under warranty. Denied vehicle trade. Reman trans. 3rd occurrence at 45k, replaced trans w/ oem under warranty. Denied trade. Transmission failure at high temp for long drives (2 hr incline) and had to wait for the trans to cool before it drove again, one occurrence at 55k, oil ok. Still intermittent power loss/slippage. Dealership unable to recreate problem. Denied trade. Ignition coils: knocking, bad gas mileage, and power loss due to ignition coil failure at 70k. Was told I needed to replace all coils rather than the one that was damaged and all spark plugs. Alternator went out after repair. Replaced all coils, plugs and alternator ($1500). Still have power loss & occasional knocking. No help from Nissan. Denied trade. Suspension: constant knocking of tire area at 60k. All 4 hubs damaged and replaced at 65k. All 4 struts leaking and had to be replaced also at 65k. No help from Nissan. Nissan quote $3000. Opted outside repair for $1000, no more problems. Emissions: more loss of power (3000rpm+) and bad gas mileage. Probably linked to ignition coil problem. Problem has been diagnosed to 1 of 4 catalytic converter sensor failures. 130k. No help from Nissan. $3000+. Fan: loud noise when a/c is on. One fan defective at 80k. Fan blade rubbing on metal frame. Replaced fan $200. No help from Nissan. Conclusion: I wanted to have my vehicle considered a lemon and traded. I had no complaint with Nissan or the Maxima line. I only had a problem with just my car. Just wanted a new Maxima. 5 lemon attempts with Nissan, rejected each time. Dismissed under strict lemon law stipulation regarding repair statute of limitations and guidelines of repair. Vehicle has been nothing but trouble. Properly maintained and have maintenance receipts and dates of each occurrence listed above.