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C320

Depends on where the noise is coming from on your Mercedes C320. If it is from the front end, then it is likely a worn suspension component such as a sway bar link (https://www.yourmechanic.com/services/stabilizer-bar-links-replacement) or a steering component like a...

Lack of fuel pressure can be caused by a failing fuel pump or a clogged fuel filter. Depending on the fuel pressure specification, the fuel pump can be condemned. A proper diagnostic inspection should be performed in order to prove...

The seat switch would need to be checked for a short to the power which is keeping the switch engaged in one direction or another. I recommend having a mechanic, such as one from YourMechanic, come check the system to...

Either the EGR (Exhaust Gas Recirculation) valve is stuck in the open position or is closed and not opening. First try removing the EGR valve and cleaning it out. Then see if the engine light goes out after cleaning the...

If you can move the tire in and out when on a jack then you may have a few different possible problems. The inner or outer tie rod ends may be worn. Your steering gear may also have worn bushings....

A YourMechanic no start diagnostic (https://www.yourmechanic.com/services/car-is-not-starting-inspection) on the problem you have written in about involves first determining whether or not full battery voltage is reaching the starter motor itself. If not, then the circuit has to be traced from the...

Those codes: P0170 (https://www.yourmechanic.com/article/p0170-obd-ii-trouble-code-fuel-trim-malfunction-bank-1-by-andrew-quinn), P0173 (https://www.yourmechanic.com/article/p0173-obd-ii-trouble-code-fuel-trim-malfunction-bank-2-by-blake-griffin), and P0335 (https://www.yourmechanic.com/article/p0335-obd-ii-trouble-code-crankshaft-position-sensor-a-circuit-malfunction-by-spencer-clayton) are indicating that the airflow coming in that is read by the MAF sensor to set up fuel injection timing does not match what the oxygen sensors are reading based on...

If the battery is draining down over time, then there is a parasitic draw that is draining the battery. A parasitic draw test needs to be done on the vehicle and once set up, the fuses need to be removed...

Hello. I suspect that the motor mounts are the cause of this rattle. Motor mounts are designed to dampen engine movement and vibrational rattles. The dealer recommends inspecting the motor mounts at 60,000 miles and every 20,000 miles after that....

Hello. From what you describe, it sounds like you may have bent an arm or two in your rear suspension. This is something that needs to be repaired sooner than later. A tire pointing in the wrong direction can cause...

Hello. It sounds like you may have some problems with the seat on you car. Sometimes the motor that actuates the seat can burn out. I would recommend having a technician from YourMechanic come out and inspect the seat, and...

The symptoms you described lead me to believe that you have a fuel delivery-related problem. I suggest that you check for fuel pressure at the fuel rail. If pressure is within factory specifications, I would then do a fuel flow...

Hello. This is a very robust transmission, as your advanced mileage demonstrates! The downshift issue you have described is likely either the governor (possibly a broken spring?), internal to the transmission, or an issue related to the throttle position sensor...

Either the EGR (Exhaust Gas Recirculation) valve is stuck open or is closed and not opening. First try removing the EGR valve and cleaning it out. Then see if the engine light goes out and the engine runs good. If...

Hi there. There is a PML valve that is on the rack and pinion steering on your vehicle. Check to see if the valve is working. The PML valve is is the speed sensitive steering valve for the steering system....

Unmetered air can cause this type of hesitation and shuddering. Too much air compared to fuel will cause a lean misfiring condition. Fault codes need to be read out of your Mercedes C320's engine computer to see if there are...

Without being able to hear the noise, it will be hard for me to offer an accurate assessment. A common issue for a ticking or clicking noise from the dash is a faulty climate control stepper motor. The Mercedes climate...

Hi. Two of the three codes you have given me have a little to do with each other. These are the p0300 and p0170 code as they are reporting issues monitoring fueling. The p0341 code indicates a failure in the...

Hi there. It sounds like maybe you have a bearing worn out on a pulley or the fan bearing may be worn out. This will definitely cause the pulley or fan to sound like if it hitting another component on...

A basic check of the key fob battery should be performed as issues can arise from a dying battery. If the key fob is malfunctioning it could be a connection issue. The smart key can be reset and re-calibrated to...