I can't diagnos problem with A4 B5 1.8t. I was driving the other day... shifted to third and it backfired when I let off too shift. Now it idles like a dragster and threw a ton of codes. I checked with my torque app via blue tooth. No vacuum reading nor afr calculated, no maf reading.. and other stuff not working as well. I assume the ecu is toast.. but why does it drive but just ruff. The wiring loam looks great and it only has 120k. Any help would be greatly appreciated.

P0444: Evaporative Emission Control System Purge Control Valve Circuit Open
P0037: HO2S Heater Control Circuit Low (Bank 1 Sensor 2)
P0418: Unknown code - More information may be available on the web
P0412: Secondary Air Injection System Switching Valve "A" Circuit
P1289: [BMW] Switching Solenoid for Air Assisted Injection Valves Bank 2 Control Circuit Signal High
[Ford] Cylinder Head Temperature Sensor Signal Greater Than Self-Test Range
[Seat/Audi/Volkswagen] Turbocharger bypass valve short to ground

P1473: [BMW] Diagnostic Module Tank leakage (DM-TL) Pump Current Plausibility
[Ford] Fan Secondary High with Fans Off
[Mitsubishi] DPF differential PRS.sensor high
[Seat/Audi/Volkswagen] EVAP Emission Contr.LDP Circ Open Circ.

P0102: Mass or Volume Air Flow Circuit Low Input
P0031: HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
P0136: O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)



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