Help with latest durametric codes

[boxsterg]

Hi, I have these codes today.
P1118 P code 4 Heating power behind cat. bank 2.
P0455 P code 94-tank vent system (major leak)
P1130 P code 361 o2 sensing adaptation idle range bank 2
P1128 P code 360 o2 sensing adaptation idle range bank 1

Before cel came on I faintly smelled gas. I've replaced the carbon canister. (when tank wouldn't fill up) The vacuum lines. Vacuum reservoir. Check valves, the two small rectangular vac. switches that connect to the vac. lines. Just replaced both pre-cat 02 sensors. per durametric. all cam chain tensioners,(corrected rattle) maf sensor.(corrected cel at the time) My car is a 2000 Boxster 2.7. also noted w/ durametric irregular roughness on cyl. 4. sometimes up to a minute between irregularities. Sometimes 5 sec. between spikes. Any help would be greatly appreciated.
Thanks

[harryrcb]

Originally Posted by boxsterg

Hi, I have these codes today.
P1118 P code 4 Heating power behind cat. bank 2.
P0455 P code 94-tank vent system (major leak)
P1130 P code 361 o2 sensing adaptation idle range bank 2
P1128 P code 360 o2 sensing adaptation idle range bank 1

Before cel came on I faintly smelled gas. I've replaced the carbon canister. (when tank wouldn't fill up) The vacuum lines. Vacuum reservoir. Check valves, the two small rectangular vac. switches that connect to the vac. lines. Just replaced both pre-cat 02 sensors. per durametric. all cam chain tensioners,(corrected rattle) maf sensor.(corrected cel at the time) My car is a 2000 Boxster 2.7. also noted w/ durametric irregular roughness on cyl. 4. sometimes up to a minute between irregularities. Sometimes 5 sec. between spikes. Any help would be greatly appreciated.
Thanks

to start with p0455 could be the gas cap is leaking or not tightened properly this will be your easiest check. If cap is ok then one of the lines could have popped off the tank. they are hard plastic and hard to lock in place under the fender.

your p1118 could be as simple as a corroded connection or loose connection. start with that. Heating current could be low or high

as for the o2 codes, start with fixing the tank vent system, clear the codes, then see if they come back.

[randy_k]

I'm not sure about the rest of the codes. But +1 on Harry's thought regarding this code.
P0455 P code 94-tank vent system (major leak). I had the same one pop up on mine and the new gas cap made it go bye bye,
Randy

[boxsterg]

Yes, I've already replaced the gas cap. Also the carbon canister, twice. Once with a used and once with a new. Anyone know which valve, solenoid, or switch, that causes excessive fumes/gas to accumulate in canister? My canister has the 3 fittings on the top and none on the bottom. My cel usually comes on when the car is idling or cruising slow thru town, and is preceded by the faint smell of gas.