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740iL

If the pump has failed, depending on the failure mode of the pump, you can diagnose the fuel pump yourself. Turn the key to the ignition (run) position. At that instant, you should hear a momentary whirring noise from the...

The ABS and brake light warning switch are on different circuits and do not work with each other. The most likely cause of the Check Brake Light message would be a wiring issue, failed bulb, improper bulb, or a brake...

You will need to have a mechanic diagnose both the codes (https://www.yourmechanic.com/services/check-engine-light-is-on-inspection) to see if you have a problem with both sensors or have a problem with the timing of the engine being out of position. The codes suggest that...

Replacing the transmission fluid (https://www.yourmechanic.com/article/how-to-replace-transmission-fluid-by-robert-tomashek) and filter (https://www.yourmechanic.com/article/how-long-does-a-transmission-filter-last) is part of the manufacturer's recommended service that should be done at intervals for regular maintenance. The transmission can have issues such as this when it is failing, low fluid level, torque...

Lending cars, Whew! it never turns out well. Its hard to imagine all those things going at once. The only scenario I can come up with is that the serpentine belt may have failed, possibly damaging the radiator, but also...

Hi there - I believe your real problem is a failed timing chain guide, which has shifted the cam timing beyond what the sensor can deal with. This is a common problem with BMW V8s with extended mileage. The solution...

I suggest you study the smoke and try to recognize a pattern. It might mean that you have to spend a lot of time looking in the mirror, so try not to be unsafe. If you are having a problem...

If the old bulb wasn't burnt out by the ballast, the new ones shouldn't either. The most likely cause of your woes are the cheap bulbs. I would strongly suggest only purchasing name brand bulbs (https://www.yourmechanic.com/article/how-to-buy-a-good-quality-headlight-bulb). They may be much...

The rear lights, including the brake lights, all go through the light control module and should have nothing to do with the ABS system. You may have bad bulbs (https://www.yourmechanic.com/services/brake-light-bulb-replacement). Have them checked to see if one or more brake...

It sounds like you have a leaking heater core inside the evaporator housing and would need to have it replaced. If you have the heater bypassed then you will not have heat inside the car and the temperature control will...

A few different things can cause the vehicle to have camshaft sensor codes. The most common would be the failure with the camshaft sensor (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-camshaft-position-sensor), timing chain damage (https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-timing-chain), improper timing, or a wiring issue. The Check Engine Light should...

Hi there, thanks for writing in about your 2001 BMW 740iL. It sounds like you have more than one problem here, and the scraping noise can be something dragging or rubbing and can only be checked and diagnosed in person....

Your car has an electronically controlled transmission. If the controller detects a fault in the transmission it goes into failsafe mode to "work around" the problem. It might for instance skip a gear that it finds to be a problem...

Hi there. Look all over the cooling system for any coolant leaks. When the engine smokes in the mornings, look to see where the smoke is coming from. If a core plug (freeze plug) is leaking, then the coolant will...

Hi there: It is very possible that the battery might be fully charged, but be lacking cold cranking amps. As a battery ages, the cells inside will begin to wear out, causing a reduction in the amount of 'cold cranking...

Simply disconnecting the battery should not have any adverse effects on the vehicle. The exception to this is if the battery was hooked up backwards, this could cause strange electrical faults. The most likely cause would be a wiring issue,...