Baumer2000S4

I've got a B7 S4 that's all stock except for a set of JHM piggie pipes on it, which I just got put on two months ago when one of my pre-cats failed, causing a whole bank to misfire.

Not soon after they were installed, I got a P0036 fault for Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2. Weather had just turned cold here in Chicago, so I figure that it was no longer being able to heat up in time before the fault threshold. I drove with that for a week or two with the plan to fix it later since I'm not due for emissions for awhile.

Well two nights ago I jumped in the car and noticed that the traction control light was on solid. Hitting the button did nothing to change the status of the light. I took the car to Autozone and had the codes read and now it has 9 codes.

P0036 - Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit
P0458 - Evaporative Emission System Purge Control Valve Circuit Low
P2401 - Evaporative Emission System Leak Detection Pump Control Circuit Low
P2257 - Secondary Air Injection System Control "A" Circuit Low
P0414 - Secondary Air Injection System Switching Valve "A" Circuit Shorted
P0102 - Mass or Volume Air Flow Circuit Low Input
P0031 - Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1 circuit
P0051 - Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit
P0057 - Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2 circuit

Has anyone seen this issue before? It seems like there's a short on a common circuit for all those devices that is taking them all down. I don't have a Bentley manual, does anyone know where they share a common circuit? Car seems to be running fine, though the gas mileage might be a little low due to the MAF and O2 issues... Hard to tell with these cars, it's so low to begin with.

Any help or ideas are much appreciated...

ProtoFly

If I had to guess, I'd check for a harness too close to the exhaust, and possibly melted. Maybe when the pipes were installed, something didn't get tied up properly...

Kilbenator

Hi, did you manage to get this sorted out? I've got a very similar set of fault codes come up. Not sure where to start...!

Any pointers also much appreciated...