Details

• Brand:

  

  

• SKU:

  CM5Z-9G444-A

• Positions: Rear Lower, Rear
• Other Names:

  Rear Oxygen Sensor, Sensor Exhaust Gas Oxygen, dy1244

• Description:

  This is the genuine Ford downstream oxygen sensor, a post-catalyst heated exhaust gas oxygen (HEGO) sensor mounted after the catalytic converter. It measures residual oxygen in the exhaust so the powertrain control module can monitor how efficiently the catalytic converter is cleaning the exhaust and verify emissions compliance. Ford lists this base under the catalog name Sensor, Exhaust Gas Oxygen. This -A application fits the 2013-2018 Ford Focus with the 2.0L naturally aspirated engine, mounting in the exhaust downstream of the converter. Drivers usually search for this sensor when the check engine light is on with a catalyst efficiency code such as P0420, when the vehicle fails an emissions or smog test, or when they notice reduced fuel economy tied to a lazy or contaminated rear sensor. Unlike the upstream sensor that trims the fuel mixture, this downstream sensor is primarily a catalyst monitor, and a sensor that reads slowly or inaccurately will falsely flag the converter or leave a real efficiency problem undetected. Installing the correct genuine sensor restores accurate catalyst monitoring and helps clear P0420-type faults when the converter itself is sound. Apply anti-seize only to the threads if the sensor is not pre-coated, route the harness away from hot and moving parts, and seat the connector fully.

WARNING: California Proposition 65

×

California Proposition 65

WARNING: Cancer and reproductive harm - www.P65Warnings.ca.gov