Chapter 23 of 25·Part XI of XII
Fault Code (DTC) Architecture & Suppression Cross-Reference
When converting vehicles for track use, deleting catalytic converters, or swapping powertrains into non-BMW chassis, diagnostic trouble codes must be cleanly suppressed at the bitmask level rather than simply clearing codes with a scanner:
| BMW Hex DTC | OBD-II P-Code | Factory Error Text | DAMOS Bitmask Switch | Technical Suppression Solution |
|---|---|---|---|---|
| 0x12 | P0136 | O2 Sensor Circuit Malfunction (Bank 1 Sensor 2) | c_conf_cat = 0 | Disables post-catalyst sensor heater & voltage surveillance |
| 0x13 | P0156 | O2 Sensor Circuit Malfunction (Bank 2 Sensor 2) | c_conf_cat = 0 | Disables post-catalyst sensor heater & voltage surveillance |
| 0x23 | P0411 | Secondary Air Injection System Incorrect Flow | c_conf_sap = 0 | Disables air pump relay trigger and MAF delta check |
| 0x3E | P0414 | Secondary Air Valve Short Circuit to Ground | c_conf_sap = 0 | Clears diagnostic monitoring for SAP diverter valve |
| 0x44 | P0444 | Evaporative Emission Control Purge Valve Circuit Open | c_conf_evap = 0 | Suppresses charcoal canister purge solenoid circuit check |
| 0x7A | P1512 | DISA Control Circuit Electrical Failure | c_conf_disa = 0 | Bypasses variable intake resonance flap solenoid circuit |
| 0x7F | P1600 | EWS Electronic Immobilizer Anti-Tampering Fault | c_conf_ews = 0 | Disables rolling code challenge/response startup interlock |
| 0x90 | P0500 | Vehicle Speed Sensor (VSS) Input No Signal | c_conf_vss = 0 | Eliminates the 5500 RPM limp-home ceiling in chassis swaps |