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320i

Hello. The noise you are hearing could very well be the differential. The fact it becomes worse when you accelerate is a good indication. The best way to tell is simply to do an inspection. Changing the oil regularly is...

It is possible that you could have a restriction in the radiator causing a hot spot. I would recommend having your radiator checked with an infrared temperature gauge to determine if any spots on the radiator are significantly hotter than...

The vehicle engine should be diagnosed on a scope (https://www.yourmechanic.com/services/engine-is-shaking-pulsating-or-vibrating-inspection). It is also possible that the poor running condition has already caused diagnostic trouble codes to set and those codes can be downloaded and evaluated by the mechanic. There are...

The valvetronic motor is stuck or not functioning properly and causing the engine to not start up. I recommend replacing the valvetronic motor. The motor is designed to cycle itself when turning on the ignition, so it is good to...

I'm still suspicious of the Battery Safety Terminal. I would take a really good hard look at that to be sure you aren't missing something. Otherwise, there may be some kind of problem with driver authorization or some other safety...

It sounds like you've been addressing a number of issues. Of the parts that you have had replaced, only the crankshaft sensor would be one that would be likely to cause your car to shut off while driving. You could...

There shouldn't be any dangerous materials in the AC system. But it is possible that you have a buildup of dust or even mold. Your car has a cabin air filter that is supposed to keep anything out of the...

Hello there, many faults will cause your 2003 BMW 320i to run poorly on cold start and have a cylinder 4 misfire. You have done great in replacing the coil packs (https://www.yourmechanic.com/services/ignition-coil-replacement), plugs (https://www.yourmechanic.com/services/spark-plugs-replacement), and vacuum pipe. Common faults would...

Hi there. Since this occurred right after driving in some dusty conditions, I would check the air filter first. If the air filter is dirty then this will occur. If the air filter is fine, then I would also clean...

Hi, thanks for writing in about the concern with the BMW 320i. If the battery was submerged in water then it's completely possible for the battery to short out and die. Your friend will need to have the battery replaced....

You will need to have the fuel pressure checked to see if the fuel pump is holding pressure over time and not leaking down. You may need to replace the pump and filter.

Hi there. The code you've listed is commonly associated with a temperature control system failure - not necessarily a problem with the radiator thermostat. There are a few easy things you can do to begin the diagnostic process. Check the...

The electric water pump circuit uses both a temperature sensor and a relay to control it's function. The temperature sensor tells the water pump there is a demand for it to circulate coolant based on engine temperature. The relay acts...

Hello there. If the oil light that you are referring to is the oil change warning light, it might be possible that a code is stuck in the ECU, which is why completing the manual reset may not be working....

Your car has an electronically controlled transmission. If the controller sees a failure in any of the components, it will go into limp home mode to enable you to continue to drive the car but it will not work as...

You could have a small oil leak or even a coolant leak. When the fluid drops on a hot surface, it burns or boils. Coolant and oil leaks are easy to distinguish if you can get where you can smell...

Hi there. Typically when a professional mechanic is trying to diagnose an engine misfire, the first thing they'll do is download any OBD-II error codes (https://www.yourmechanic.com/article/how-to-read-and-understand-check-engine-light-codes-by-jason-unrau) to pinpoint the source of the ignition issue. Without knowing those codes, telling you...

There are a number of things that may cause this such as a faulty or dirty mass air flow sensor (https://www.yourmechanic.com/services/mass-airflow-sensor-replacement), a potentially a bad idle air control valve (https://www.yourmechanic.com/services/idle-control-valve-replacement), or dirty fuel injectors. The mass air flow sensor is...

Hello there, oil lights can be slow to respond to for a lack of oil in your 2004 BMW 320i. 10 liters of oil is excessive oil consumption. Excessive oil consumption is a problem and can damage your engine if...

Your issue seems to be temperature related. Taking too long to reach proper operating temperature can be cause by two things. First thing I would check is if either the electric cooling fan is running all the time no matter...