DTC P0156 Cadillac
HO2S-22 (Bank 2 Sensor 2) Circuit Malfunction
HO2S-22 (Bank 2 Sensor 2) Circuit Malfunction
Description
DTC P0135, P0139, P0140 and P0141 not set, engine speed from 1400-2400 rpm, HO2S-12 signal is operational, engine load from 8-12%, MAF sensor from 18-22 g sec, throttle angle from 6-10%, AIR System test off, engine runtime over 10 minutes, low fuel not
Cause and Solution
Air leaks in the exhaust system, intake manifold, vacuum lines
EVAP Purge system malfunction or charcoal canister problems
HO2S signal circuit is open between the sensor and the PCM
HO2S signal circuit is shorted to sensor or chassis ground
Video Guide
Diagnostic Info
- DTC Code: P0156
- Brand: Cadillac