Q: When I switch on the vents the cabin starts smelling

The fuse for "exterior lighting" is the only thing that all three of these circuits share. If that checks out ok, you might be having different issues. The turn signals and hazard lights do share some wiring. The turn signal...

Thanks for writing in about your Chevrolet HHR. From what you've described you'll need to check the shift cable to see if the cable is attached to the transmission and bracket. It may have come loose when you lifted the...

This may be a variety of potential issues. I would start by checking the oil (https://www.yourmechanic.com/services/change-oil-and-filter) to see if there are traces of water in it. Also, check the water to see if you find any trace of oil it...

working on this

Hi and thank you for contacting YourMechanic. If all fuses and the battery check out, then it sounds like there is a ground issue. Check for corrosion on the black ground cable for the battery. Make sure all connections are...

Hello - most likely the speedometer sensor (https://www.yourmechanic.com/article/how-long-does-a-speedometer-sensor-last) has failed, or the wiring to it has become disconnected. Check that first. It's also possible that the speedometer sensor drive gear has failed (small plastic gear), or the instrument panel speedo...

Your vehicle does not rely on a single ignition wire at start up. When you turn the ignition key, many different circuits are actuated, even within just the ignition system (not to mention the fuel system), corresponding to different vehicle...

If the engine does not reach operating temperature in a certain time the computer will go into open loop and may even lock out the overdrive if the problem continues. You will need to check engine codes to do pinpoint...

The oxygen sensor trouble codes that you are referring to will set due to trouble not only in the oxygen sensor itself but the oxygen sensor circuit too, which includes wiring, terminals, grounds, etc. Therefore, unless the O2 code(s) you...