Heftige Probleme mit dem Porsche Cayenne 9PA, nur Zündungsprobleme oder weit aus mehr ? Eine Analyse

The Porsche Cayenne is experiencing problems. The engine is running rough, the idle speed is fluctuating, and there's a loss of power. Many causes are possible with this description of the problem. To narrow down the cause, a diagnostic tool is needed. However, some of the displayed errors are secondary to the original problem. Typically, a multitude of errors are displayed initially. For example, an ignition fault will also trigger lambda sensor errors. The faulty ignition leads to incomplete combustion. As a result, the lambda sensors detect that the exhaust gases are no longer within acceptable limits. Therefore, you should always check and write down all the errors first. With the engine off, clear all the errors and check if the engine is then error-free. This is possible with engine faults, and the engine will be reported as fault-free. However, with other faults, such as airbag faults, it may be impossible to clear the errors. This is because the fault can be permanent and is independent of whether the engine is running or not. Secondary errors, however, can sometimes still be cleared. In the case of engine faults, all errors can usually be cleared as long as the engine is switched off. Only when it is restarted will the fault, and subsequently any consequential errors, be written back into the control unit. For example, in the case of an ignition fault, the "lambda sensor(s)" will also appear as an error because the exhaust gases are no longer within the acceptable range. I therefore recommend reading and noting all the fault codes. Then clear them all. Start the engine and see which fault code is written first. Shortly afterward, the consequential errors will also reappear. This is exactly what happened in our case. The combustion fault on cylinder 7 is the first fault code, and it appears immediately. The consequential errors follow. Once the actual fault is found and rectified, the other fault codes will disappear. Furthermore, the displayed fault codes are not always the actual cause of the problem. For example, with the "lambda sensor" fault, every workshop will replace it. Hundreds of thousands of "fault-free" sensors are removed and scrapped every year. The error code "lambda sensor" simply means that the values ​​transmitted by this sensor to the engine control unit (ECU) do not match the expected values ​​(from the engine control unit's database). This is a common occurrence in vehicles that don't yet have fully equipped sensor systems (which is currently almost all vehicles). So, for example, if the throttle valve isn't functioning correctly, the lambda sensors are the first to detect this. These are then replaced unsuccessfully by the "specialist workshop." Only after this is the throttle valve defect discovered and repaired. What remains is an inflated bill. It will state that lambda sensors were replaced because they were defective, and the throttle valve was replaced. This results in considerable repair costs due to unnecessary labor (removing and installing new lambda sensors), unnecessary parts costs (e.g., two new lambda sensors), a new throttle valve, labor, and computer diagnostic costs. The customer then has to pay for all of this. Furthermore, it's questionable whether simply cleaning the throttle body wouldn't have sufficed. Often, these are only stiff and sticking due to carbon buildup or dirt, which then leads to problems. Frequently, throttle bodies can be freed up from the outside without disassembly. But today's workshops don't "repair" anymore; they just replace parts. Repair is limited to removing the old part and installing a new one. How do I know this? Well, for many years I was the managing director of a car dealership with an attached repair shop. Computer diagnostics are also typically charged at €50 and up. There's no faster way to save money than to carry out repairs on your own car. Purchasing a diagnostic tool pays for itself very quickly. Unfortunately, a good diagnostic tool costs at least €200. This is despite the fact that vendors of cheap devices starting at €2 would have us believe otherwise. You only need to take a look at the diagnostic equipment in a car repair shop. None of them cost less than €200. So it's worth buying an original device from a reputable manufacturer (the internet is full of laptops and tablets with cracked diagnostic software). My diagnostic tool used to cost over €2,000. But since there's now a successor model, and mine is no longer being updated, I was able to buy a new one for about €1,000, including various accessories. One drawback is that I can only read data from vehicles manufactured up to and including 2015. Therefore, this device is uninteresting for professionals. But it was sufficient for me. So save your money, because "NOW I'LL HELP MYSELF." Yours, Pixel