I recycled the engine, and it ran fine for another 100 miles or so. When I got home I found these codes: 2CF9 - Throttle valve potentiometer 1. 2CF6 - Throttle valve potentiometer 1, plausibility with regards to air mass. 2D09 - Throttle valve. 2A17 - DMTL diagnosis module tank leakage, system failure. 29D2 - Misfire Cyl. 6. #BMW #bmwz4 In this buyers review we check the BMW Z4 for common issues, explain what to look for when buying such a car and tell you a bit about its engines 669 posts · Joined 2007. #4 · Jun 5, 2009. Turned out to be the airbag control unit which is located just beneathe the BMW Assist. There was corrosion on the mult-pen plug-in. The dealer refused to pay saying that I had apparently left the top down in the rain - and I had. Cost me $1114, half of which was a new control unit and the rest was It replaced the Z3 and an E89 version came out in 2009 followed by the G29 in 2018. The Z4 is a good car tuning project to execute. The key to Z4 tuning is balancing power and reliability you can waste loads of money if you do it wrong. Turning our attention to the engine we need to get a bit more power out of the top end. Alright, I know it’s a common thing where many E85 Z4 owners wish to buy or have a hardtop rather than the stock soft top. it’s great having a convertible, but with all the issues that arise with replacing damaged or failing hydraulic motors, electric motors, or vandalism due to people wanting to get inside your car, many would rather take to a hardtop. 2015 Alfa Romeo 4C. used 2020 BMW Z4 things to know before buying a 2022 BMW Z4. Related: 10 Car Brands That Build The Most Unreliable Engines. 2023 Mazda MX-5 Miata used 2016 Mazda MX-5 Miata In this specific one, we get to see the 2003 E85-gen BMW Z4 Roadster take on all of its main convertible competitors. This comparison test from August, 2003, consisted of the five best sporty Joined: Mon Oct 31, 2016 4:53 pm. by ph001 » Thu Sep 21, 2017 1:06 pm. Timing chain issues are incredibly rare on the N52. Much more common is HVA noise due to air in the hydraulic lifters. Car needs to go for a good blast down the motorway which usually sorts it. One of the 2 fuel senders on my 03 Z4 has been bad for about a year now. I have never gotten round to changing it due to how ridiculously expensive the quote was, caused by the fact that you have to buy the whole fuel pump/sender unit as a combined item and then have the tank dropped to change it. The Z4 Coupe’s greatest asset is arguably its N52B30 3.0-litre straight-six. It’s the most powerful naturally-aspirated non-M Division inline-six BMW ever made, and in the Z4 Coupe it belts ZXUd9.