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540i

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Question
Smoking exhaust on starts
The smoke coming from your exhaust may be from three things. The normal start up moisture in the exhaust is considered normal if the smoke looks white and is not too heavy and goes away within a minute. The next...
Question
Fan stays on when car off
The blower motor resistor seems to be a common repair on your car. It can cause the blower motor to run when the key is off. The heat and AC and your car has a dedicated computer. It also could...
Question
Power steering cutting out
Hi, first I would recommend checking the fluid level under the hood and make sure the level is correct. If you are low on fluid, it can create pockets of air, causing a loss in power steering as you turn...
Question
Fail Safe Mode coming up on dashboard
The output speed sensor is a very important sensor for the computer in your BMW 540i. It uses this signal to determine shift points as well as when to lock up the torque converter. If the computer detects a problem...
Question
poor acceleration check engine
You will want to have the catalytic converters checked. The 540's are notorious for the catalyst inside the catalytic converters breaking apart from the outer wall of the assembly and rattling around, especially upon take off. This will also create...
Question
Battery light is on and car has no power steering
If the Battery Light is illuminated and the battery passes a load test, then you most likely have a faulty alternator; a charging system test would need to be performed to verify this. On the 2001 540i, the power steering...
Question
Camshaft position sensor error code P0343
Hello. The P0343 code indicates there is no signal from the passenger side cam position sensor (Bank 1 actually). Given you have changed the sensor, this would suggest a wiring or connector issue. Your mileage would also make me anxious...
Question
I had to change output the speed sensor, but my car still drive in 5 high. What do I need to do?
Hi there. Since you have replaced the speed sensor and your vehicle is still giving you the engine light code P0720 for the speed sensor circuit malfunction, then you would need to check the circuits from the speed sensor to...
Question
Entire bank1 misfires, and lower compression. 1997 BMW 540
Hi there - yes, it is possible to have cam timing for one cylinder bank off after a timing chain component repair. Way too easy actually with this engine! If you did not loosen the cam sprocket to cam bolts...
Question
Hi I have 97 BMW 540i, replaced radiator, water pump, and thermostat.. and a engine temperature sensor and it is still overheating
The heater not working in some cases may be related to the overheating problem you are also having. This may be due to a faulty heater blower motor or potentially a bad heater core. As you may know, the heater...
Question
Why does my car have to turn over a couple times when it is mildly warm?
You may have a problem with injector leakage. When the car has been running the fuel system stays pressurized for a few hours. When the injector valves are old, there may be a small amount of leakage at the tip...
Question
P0505 code Idle Air Control for bmw 540i
The TPS can have between 5 and 10 different codes and all will be caused by different failures of the TPS, Throttle body, wiring or computer issues and you will need to supply the code you get to help you...
Question
Water leaking from pillar sunroof drain into passenger footwell
Yes, diagnosing the leak and implementing the required repairs is no problem and is a fully covered service. To request that service, you can schedule via YourMechanic's leak diagnostic service page. If the drain tube is readily accessible, I can't...

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