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Before I buy a new sensor, I’d like to try cleaning the EVAP (evaporative emission) system.
Is there any guide for that? Do you have experience with it?
Or should I just go ahead and buy a new sensor?
Cleaning the EVAP system ??…never heard of that…and how do you need you need a new sensor ??…you can have a clogged canister or a blockage at the vent valve…are you using a factory level or equivalent aftermarket scan tool ??…with the gas cap removed and engine off do see you about 1.5 volts on the fuel tank pressure sensor ??
I found this older discussion about this error code.It’s possible that I misunderstood something. The guy who was dealing with this code wrote that he replaced the fuel tank pressure sensor. I would really appreciate it if you could advise me on the exact first steps I should take before buying a new sensor. Thank you very much
First step what is the model year of your car ??…not all C5’s are the same…I saw in a previous post you have a 1997…as a new member can you put this info as a minimum in your profile as shown below ??…I don’t even see a P0446 listed in Service Info until 1999…below is the troubleshooting chart for a 1999…don’t just shotgun parts until you diagnosed this per the chart.
Evaporative Emission System Cleaning (EVAP)
