What does code P1173 mean?

Q: What does code P1173 mean?

HO2S Bank 2 Sensor 1 Circuit Fixed Bank 2 Sensor 1. P1173 on Mazda vehicles means the powertrain control module has detected that the Bank 2 Sensor 1 heated oxygen sensor (HO2S) signal is stuck or fixed within a narrow range instead of switching normally. The computer expects the upstream sensor on the bank opposite cylinder one to oscillate rapidly between rich and lean as it corrects fuel delivery, and a fixed signal indicates the sensor or its circuit is not responding to changing exhaust oxygen content.

DTC codes / Mazda codes / P1173

P1173 · MazdaHO2S Bank 2 Sensor 1 Circuit Fixed Bank 2 Sensor 1

P1173 on Mazda vehicles means the powertrain control module has detected that the Bank 2 Sensor 1 heated oxygen sensor (HO2S) signal is stuck or fixed within a narrow range instead of switching normally. The computer expects the upstream sensor on the bank opposite cylinder one to oscillate rapidly between rich and lean as it corrects fuel delivery, and a fixed signal indicates the sensor or its circuit is not responding to changing exhaust oxygen content.

SystemPowertrain

Code typeMazda specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Guidance is general and written for Mazda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.