I’ve been troubleshooting some issues with my 2000 Discovery 2. The two I’m stuck on are a massive evap leak and Oxy Sensor Heater Downstream Cat Bank 1 Drive Cycle C.
I think the evap leak was being caused by the EVAP canister vent valve WTY000020. Same part as the ACDelco 214-1091. I pulled the part to test it. It was a little sluggish closing and opening. I cleaned it and then it worked like a solenoid is supposed to. But when I’d try and pass air thru it when closed it would leak. So I looked inside and found the coil spring that pushes the valve back open was bent enough to allow one of the coils to get between the valve and seat which created a leak. I did the repair and tested it again. This time zero leaks. So far the truck has been happy as I’ve yet to throw another evap massive leak code. I pray it stays that way.
The O2 sensor is a completely different issues. I’ve replaced all four O2 sensors. Graphing both the input and output O2 readings showed the cats are working. Yet even after the replacements I’m still throwing this code. I’m stuck and could use some help.
I think the evap leak was being caused by the EVAP canister vent valve WTY000020. Same part as the ACDelco 214-1091. I pulled the part to test it. It was a little sluggish closing and opening. I cleaned it and then it worked like a solenoid is supposed to. But when I’d try and pass air thru it when closed it would leak. So I looked inside and found the coil spring that pushes the valve back open was bent enough to allow one of the coils to get between the valve and seat which created a leak. I did the repair and tested it again. This time zero leaks. So far the truck has been happy as I’ve yet to throw another evap massive leak code. I pray it stays that way.
The O2 sensor is a completely different issues. I’ve replaced all four O2 sensors. Graphing both the input and output O2 readings showed the cats are working. Yet even after the replacements I’m still throwing this code. I’m stuck and could use some help.