27C5

27C5 - P2430

Information saved in
DME

Fault code
27C5 - P2430

Fault text
Air-mass sensor, secondary air, plausibility

Fault description
Secondary Air Injection System Air Flow/Pressure Sensor
Circuit (Bank 1)

Condition for fault identification
Test condition:
sls_obd_max after 10 sec. SLS operation under
KL_SLS_OBD_HFM_DIAG_MIN
or after 20 sec. SLS_operation
sls_obdh_mdf_max_intg_norm <
K_SLS_OBDH_EUV_MIN_DEF and higher exhaust gas
lamda
Terminal condition: Engine running
Voltage condition:
Battery voltage > 10.8 V (k_sls_obd_ub_min)

Condition for fault memory entry
30000 ms

Action in service
1. Remove secondary air line from secondary air pump
2. Conduct test routine
3. If secondary air pump runs/air flows out, and error is still
logged, replace the mini-HFM

Fault effect and breakdown warning
MIL is on after 2x engine cold start

Driver information
Warning light:
MIL

Service instruction
none