Good Afternoon chaps,
My car is your standard A3 1.8T Stage 2. Running FBO (exhaust, intake, intercooler) with minor deletes (PCV, N249 etc.) running AEM WMI. Car peaks at 21 psi (1.5 bar) and holds 17 psi (1.2 bar) to redline. Running AEM V2 nozzle. Start spray at 5 psi and full spray 20psi.
I've been having trouble with a Pre-cat o2 sensor code. 17511 (see pic below)
I am running 50/50 water meth mix. (bought a barrel of 25L 99.8 pure methanol and dilute it using a weight scale with distilled water)
The code starting popped up first a couple weeks ago. Cleared it and kept coming back. I replaced the o2 sensor for peace of mind however code keeps on coming back. So I did some trouble shooting.
I did a 100 mile (160km) drive over 2 days with the WMI off. The 100 mile drive did not triggle the 17511 fault code. I do a 30 mile (50km) drive with the WMI on and the fault code appears. The 30 mile drive would be doing a pull of 4.5krpm when joining the motorway and letting the WMI system go on full spray.
So with WMI the code appears but when driving without WMI the code disappears. Also, I never had this code pop-up BEFORE I installed my WMI system. Code does not trigger a CEL and there are no other accompanying codes.
I think it's safe to say that the WMI is triggering this code. What can I do? I replaced the o2 sensor with a genuine Bosch wideband one. Should I worry about this code?
Any input is greatly appreciated,
Cheers,
S.Pellegrino
My car is your standard A3 1.8T Stage 2. Running FBO (exhaust, intake, intercooler) with minor deletes (PCV, N249 etc.) running AEM WMI. Car peaks at 21 psi (1.5 bar) and holds 17 psi (1.2 bar) to redline. Running AEM V2 nozzle. Start spray at 5 psi and full spray 20psi.
I've been having trouble with a Pre-cat o2 sensor code. 17511 (see pic below)
I am running 50/50 water meth mix. (bought a barrel of 25L 99.8 pure methanol and dilute it using a weight scale with distilled water)
The code starting popped up first a couple weeks ago. Cleared it and kept coming back. I replaced the o2 sensor for peace of mind however code keeps on coming back. So I did some trouble shooting.
I did a 100 mile (160km) drive over 2 days with the WMI off. The 100 mile drive did not triggle the 17511 fault code. I do a 30 mile (50km) drive with the WMI on and the fault code appears. The 30 mile drive would be doing a pull of 4.5krpm when joining the motorway and letting the WMI system go on full spray.
So with WMI the code appears but when driving without WMI the code disappears. Also, I never had this code pop-up BEFORE I installed my WMI system. Code does not trigger a CEL and there are no other accompanying codes.
I think it's safe to say that the WMI is triggering this code. What can I do? I replaced the o2 sensor with a genuine Bosch wideband one. Should I worry about this code?
Any input is greatly appreciated,
Cheers,
S.Pellegrino
Last edited: