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530i

It's never a good idea to drive a car with a misfiring engine! If the misfire is due to a bad spark plug as you are presuming, there could be secondary ignition voltage feeding back to the ignition system which...

A number of things may cause codes P0171, P0174 and P1083 to be triggered. As the codes indicate, this means there is a lean fuel condition which may be caused by a lack of fuel supply or in some cases,...

There are a number of things that may cause the car to hesitate (https://www.yourmechanic.com/services/engine-hesitates-during-acceleration-inspection) when accelerating such as low fuel pressure, a dirty or faulty mass air flow sensor, clogged or dirty fuel injectors, a faulty throttle position sensor or...

Hi There, It sounds like you may need to replace the oil cap o-ring. If you haven't done this before there are two O-rings to replace; a small green one on the base of the filter cap stem and the...

There may be no easy answer for this. Modern cars are so thoroughly insulated and sealed, and the interior structures are so complex that it can be very difficult to find the kind of leak that you're looking for. It...

Hello there, a few common faults will cause your 2004 BMW 540i to have a misfire on acceleration. Without knowing what code the engine is storing I can only offer general advice. Likely causes for the car to misfire like...

Hello. I would need to know some more information about what you car is doing to be able to help with a diagnosis. If it is giving a pressure control code then most of the time this is caused by...

It's hard to tell without doing some further testing. This sounds like a misfire. A misfire (https://www.yourmechanic.com/services/engine-is-misfiring-inspection) can be caused by several components. It would explain the "limp mode", the shaking (https://www.yourmechanic.com/services/car-is-shaking-or-vibrating-inspection), and the Check Engine Light (https://www.yourmechanic.com/services/check-engine-light-is-on-inspection). Misfires are...

System too lean means that the fuel mixture has moved beyond the ability of the feedback system to compensate. One thing that can cause that is an air leak that enables air to enter the intake system without passing first...

If the Check Engine Light is on this would be helpful as the codes that would be triggered by this would generate useful information relating to the problem. Without the benefit of hooking the car up to a scanner and...

Based on the codes, one of the more likely failures relates to a break in the mechatronic sealing sleeve and adapter (BMW parts nos. 24347588725 and 24347588724). Of course there are other and additional possibilities but such can only be...

Hi James. Thanks for contacting us today. As the owner of a 2009 BMW 128i that just had it's last payment made, I can tell you that routine maintenance and service for these vehicles is on the average, 30 to...

It sounds like you may have an electrical faulty or short related to your alternator which may cause the popping sound you hear. As you may know, the alternator charges the battery while the engine runs by generating amperage and...

Hello - the ad appears to be gone, so perhaps you already bought it?! I wouldn't blame you if so. As a long time E39 owner, they are an excellent sport touring car, especially if more than 2 passenger capability...

Hi there. The message is coming on for the catalytic converter overheating. A misfire or leaking injector will cause the catalytic converter to overheat as raw fuel enters the exhaust system. Check the engine for a misfire and see which...

Hi there. There are varied opinions about switching from synthetic oil to conventional oil (https://www.yourmechanic.com/article/what-are-the-risks-of-switching-to-synthetic-oil-in-older-cars). I am old school and believe you stick with the manufacturer's recommendation for oil type. Nowadays, most conventional oils are a synthetic-blend. I believe BMW...

Hello. A transmission replacement for that model of vehicle will likely cost a few thousand dollars, including the cost of labor to install it. At the moment YourMechanic, does not currently offer engine or transmission mechanical services. For a repair...

The P0155 (https://www.yourmechanic.com/article/p0155-obd-ii-trouble-code-02-sensor-heater-circuit-malfunction-bank-2-sensor-1-by-jamahl-walker) is the oxygen sensor located on the rear bank of cylinders and before the catalytic converter. Given your mileage, both oxygen sensors (https://www.yourmechanic.com/services/oxygen-sensor-replacement) (pre-catalytic converter) should be replaced. The pre-cat sensors have the most affect on fuel...

You will need to have the dealer register the battery to the computer or the vehicle may not work correct and not charge the battery as it should. The new battery will need to be registered to your VIN in...

Your vehicle is in limp mode to prevent engine damage from the overheating. I suggest you let the motor cool for a while before trying to drive it again, if at all. I also suggest having a certified technician, like...