Fix for a Honda P0141 code

Diagnose and fix a Honda P0141 code

A Honda P0141 code is defined as: Secondary Heated Oxygen Sensor (Secondary HO2S) (Sensor 2) Heater Circuit Malfunction. Don’t automatically replace the oxygen sensor just because it’s listed in the code. Here’s how to diagnose the code.

The most common causes of a Honda P0141 code

This code often shows up right after a tech has worked on the airbag passenger presence detector in the passenger seat. The airbag system occupant position detection sensor is a common failure. To repair the sensor, the technician must disconnect the connectors under the passenger seat. If the tech swaps the connectors, you can get an airbag light, along with a P0141 code.

The connector to the post cat sensor is located under the passenger seat carpet. If any work was done on the seat or the occupant sensor in the seat, the connector swap may be at fault.

Start by checking the connector

Open the connector and check for corrosion on the terminals. If no corrosion found, use a multimeter and test for battery voltage on terminal 4 (Black/red) in the wire harness terminal with the key in the RUN position. If there’s no voltage, check the Oxygen sensor fuse.

Next, check for ground on the Black/White wire in the wire harness terminal. If there’s no ground, check for an open condition between the connector and the ECU.

If you find battery voltage and ground, test the O2 sensor heater resistance on the sensor side of the connector. Set your meter on the Ohms scale and test between terminals 2 and 4. Resistance should be 5.0 to 6.4 Ω at room temperature. If the heater resistance is off, replace the sensor.