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540i

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Question
Water pump possibly leaking.
The leak would have to be identified by pressure testing the cooling system to see what is leaking. I have seen radiators leak soon after replacement. Have your mechanic pressure test and check the system for leaks. If the leak...
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
Main motor clutch fan going out
When a clutch fan goes out, it doesn't create additional drag, the fan is just moving the same speed as the pulley it is mounted to. The noise you are hearing is most likely the belt tension. When a belt...
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
lights won't turn off
These types of lighting malfunctions can occur if the lamp module has failed. This module generally needs to be coded by a dealer if it is replaced unless you can either locate a precoded lamp module from the dealer or...
Question
clutch not working properly
If the engine RPM's raise and speed does not match especially under loaded acceleration or in higher gears, this is the first indication of a worn clutch disc. Clutch disc thickness needs to be checked and if the thickness is...
Question
air conditioner not working
It definitely sounds like the IHKA control unit, especially since the displays are not working. One other possibility, and this still may be an issue if the blower cannot be controlled, is a failed final stage, which is a common...
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
starting problems voltage surge
Overvoltage spikes can cause damage to any of the computers on the CAN bus which are involved with the vehicle starting system. However on the 540's, in the e-box under the hood, the main relays are known for failure and...
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
Cheap ABS code readers for 2000 BMW 540I
For a BMW, there aren't that many options. You could try Actron -- they make one that costs 250 dollars. I use it all the time. I don't know if it will read it on a BMW, but it'll read...
Question
Engine code after repair
If the sensor is defective then the sensor can be replaced without replacing the entire housing again. The sensor will need to be checked with a scan tool to see if its giving the correct readings by comparing the data...
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...

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