O2 Sensor Heater Codes with Meth Injection

[BigBadBen]

I recently installed an HFS-6 system on my Porsche 996TT. I am running a 75/25 meth to water ratio.

I have been getting an odd code coming up only when I am running my Aquamist system whereby the front 02 sensor heaters seem to be throwing these codes.

I am running a catless 3" exhaust.

P0155 Oxygen Sensor Heater ahead of cat bank 2
P0135 Oxygen Sensor Heater ahead of cat bank 1

When I switch back to my pump file with no meth injection the codes do not come back so obviously the sensors are fine!

I am wondering if the meth injection is fooling the DME into thinking there is a problem with the 02 sensors because of the unexpected low temperature readings at the sensors when the meth is being sprayed.

Any thoughts please.

Cheers,

Ben

[Richard L]

This is interesting.

How much 75/25 are you injecting? Or if you know the water jet size. I was wonder if you have set the system to cut in too early?

Richard

[BigBadBen]

Hello Richard,

Well I did some more data logging tonight and found out that if I run on my pump map which is 94 octane and have the meth engaged the codes no not come up!

I am running two .90 jets with the following settings:

Thres Adj at 11:00 am
IDC Trim at 8:30 am or fully CCW
IDC Gain at 11 am

Ben