Code Definition

P1173 — Oxygen sensor 1, bank 2 no signal

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Ford

About P1173

P1173 is a manufacturer-specific powertrain diagnostic trouble code recorded for Ford vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1173 is stored, the module has detected a bank-specific fault, meaning it applies only to one cylinder bank of a multi-bank engine; and a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1173 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Powertrain Control Module (PCM) relies on the upstream oxygen sensor (sensor 1) on Bank 2 to provide a switching voltage signal that reflects exhaust oxygen content for closed loop fuel control. DTC P1173 sets when the PCM detects no usable signal from the Bank 2 sensor 1, meaning the sensor output is flat or absent rather than switching between rich and lean. Bank 2 is the cylinder bank that does not contain cylinder number 1, and sensor 1 sits ahead of the catalytic converter. A missing signal can result from an open or shorted sensor, a break in the wiring, a lost sensor ground or refer...

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