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530i

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Question
Po155cnf bank 2 sensor heater circuit P1620cnf Also code
The P0155 is the oxygen sensor located on the rear bank of cylinders and before the catalytic converter. Given your mileage, both oxygen sensors (pre-catalytic converter) should be replaced. The pre-cat sensors have the most affect on fuel mixture, saving...
Question
The engine steams well but does not accelerate when pedalled
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...
Question
My car is not starting
Your car has advanced systems that utilizes a CAN (computer area network) for communication with all its systems. Your starter motor will not turn if the CAS (car access system) can't confirm that certain conditions do not exist. It could...
Question
Fail safe Mode engaged with the engine shaking. Possible over revving of the engine
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...
Question
Smoke and possible oil leak after having oil serviced
Hi there. Since you drive the vehicle so little it can still be residual oil. It can take some time for it to burn off, especially if it pools up when it is spilled. If there is no oil left...
Question
My car shakes sometimes at a stop light, reduced engine peeformance and just recently went into limp mode also check engine light
It's hard to tell without doing some further testing. This sounds like a misfire. A misfire can be caused by several components. It would explain the "limp mode", the shaking, and the Check Engine Light. Misfires are caused by...
Question
wont go faster 35mph
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...
Question
Car reads "Pressure Control Valve 3V". I believe it has to do with a solenoid.
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...
Question
Every 500 miles, 'check engine' light comes on and oil has to be added
Hello. It is common for this engine to consume oil as it ages. Typically the oil consumption comes from the valve stem seals. The only way to repair it is with rebuilding the cylinder head. I usually will look into...
Question
How to change battery in fob
Hello. The batteries for these key fobs are available from most auto parts stores and online. Once you get the battery the case is easy to split apart to replace the battery. This can easily be done on your own....
Question
Right turn signal blinks faster than left; 'Oil light' stays on
Hello. If the low oil light continually comes on then it is a bad sensor, assuming that the oil level is fine. This is located in the oil pan. The sensor will most likely need to be replaced. As...
Question
Steering wheel vibrations can be seen and felt
Hi there. If the steering wheel is vibrating at this speed and it is occurring whether you apply the brakes or not, then you more than likely have a tire that is failing. When a tire begins to separate, this...
Question
Getting several codes fuel system too lean, Misfire cylinder 3 fuel cut off, misfire detected with low fuel
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...
Question
Hello, I just bought a 2007 BMW 530i and wanted to get a feel for how much a transmission replacement would cost?
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...
Question
Spark plug
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...
Question
Why my key won't turn in my ignition?
Hello. The symptoms you are having with your ignition cylinder may be attributed to several faults. Make sure the steering wheel is not locked by rotating it both directions and making sure it will move. Afterwards, the first and easiest...
Question
Will it hurt my motor to switch from synthetic oil to conventional oil?
Hi there. There are varied opinions about switching from synthetic oil to conventional oil. 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 recommends...
Question
My son has a BMW. It will be driving fine and then all of a sudden the gas pedal will be pushed down and it will not move.
Hi there. When the Check Engine Light is on, retrieve the codes as this helps guide the diagnostic process. It does sound like you either have a water intrusion problem into a connector or electrical component or there is a...
Question
Misfires at high speed on a high way
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...
Question
Gas leaking from under/around fuel tank
Hello. Fuel leaks need to be taken seriously. You will want to look into this immediately. Is the vehicle only leaking when it is running? If this is the case its likely coming from a line or a fitting somewhere...

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