![]() ![]() In most cases, power output and acceleration are heavily affected. Symptoms include engine hard starting with long cranking, rough idle, and a yellow 1/2 ‘check engine light. High-pressure fuel pumps and injectors are the usual failure points. This is a delicate system that can be damaged by low-quality fuel. Newer BMW vehicles, starting from E90 335i, have engines with high-pressure fuel injection. A bad alternator regulator can cause similar symptoms, as well. If your battery is over seven years old, it is time to change it to avoid other electrical issues. BMW vehicles are susceptible to voltage, and if the battery is old, it may hold a proper charge. BatteryĪ weak battery can cause BMW Engine Malfunction and Reduced Power messages on the iDrive screen. In either case, please turn off the engine immediately and do not restart it. Timing that has jumped two or three teeth will cause an engine rattle, a yellow 1/2 ‘check engine light, and Vano’s related codes.Ī Red 1/2 ‘check engine light will indicate a bigger timing jump. Tensioners or plastic guides can fail, too. Although timing chains are supposed to be lifelong items, they can get exclusively stretched with time. Timing chain-related problems can trigger a ‘check engine light. A loose connector to the ignition coil can cause the BMW engine to malfunction yellow light to come on. Ignition coils are easy to replace, so it’s a good idea to have one spare ignition coil. Misfire damages your catalytic converter, so don’t drive your BMW with a misfire. It will result in a misfire, causing the engine to shake and judder under acceleration. Ignition coils can fail for many reasons. ![]() Whatever the reason, it will affect the engine performance, and you will get a yellow 1/2 ‘check engine light.Ĭodes: 2C9C, 2C9C, or P0171 to P0174 Ignition Coils Furthermore, damaged wiring or a loose connector is also possible. Upstream O2 sensors can get fouled by excessive fuel or oil consumption. Usually, after starting a cold engine or at idle for the first few seconds.īMW engine control uses readings from upstream O2 sensors to achieve optimal engine performance. In addition to the “BMW engine malfunction reduced power” message, you will also notice engine noise such as tapping or knocking (VANOS area). Luckily, faulty Vanos solenoids are an easy and cheap thing to fix. This is a result of too-long oil change intervals. In most cases, it will fail if there is an oil sludge buildup within the Vanos solenoids. It is a straightforward and robust system. The usual failure points are an electric motor and an eccentric shaft position sensor.Ĭodes: 2A61, 2A63, 2A67, 2A6F, 2A70 Vanos If it fails, you might have a poor throttle response and a lack of power. It variates the amount of intake valve lift, eliminating the need for a throttle plate.Īlthough this is quite a complex system, it is quite durable. Most BMW engines are equipped with Valvetronic. ![]()
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