DTC P0141 (KA/Kc) (2016 2017 2018 2019)

DTC P0141  : Secondary HO2S (Sensor 2) Heater Circuit Malfunction

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   DTC (PGM-FI)

   -3. Start the engine, and let it idle.

   -4. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0141 Secondary HO2S (Sensor 2) Heater Circuit Malfunction

   Is DTC P0141 indicated?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at secondary HO2S (Sensor 2) and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot .

2. Shorted wire check (IG1 (ACG)/IG1 ACG line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Check the following fuse.

   Fuse	No. C30 (10 A)
   Location	Under-dash fuse/relay box

   Is the fuse OK?

   YES 

   The IG1 (ACG)/IG1 ACG wire is not shorted. Go to step 3.

   NO 

   Repair a short in the IG1 (ACG)/IG1 ACG wire between secondary HO2S (Sensor 2) and the No. C30 (10 A) fuse. Also replace the No. C30 (10 A) fuse.

3. Secondary HO2S (Sensor 2) internal heater resistance check

   -1. Disconnect the following connector.

   Secondary HO2S (Sensor 2) 4P connector

   -2. At the sensor side, measure the resistance between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Secondary HO2S (Sensor 2) 4P connectors: disconnected
   Test point 1	Secondary HO2S (Sensor 2) 4P connector No. 3 (secondary HO2S (Sensor 2) side)
   Test point 2	Secondary HO2S (Sensor 2) 4P connector No. 4 (secondary HO2S (Sensor 2) side)

   Courtesy of HONDA, U.S.A., INC.

   Is there 5.4-7.3 Ω at room temperature?

   YES 

   Go to step 4.

   NO 

   Replace secondary HO2S (Sensor 2) .

4. Secondary HO2S (Sensor 2) internal circuit check

   -1. At the sensor side, check for continuity between test point 1 and 2

   Test condition	Vehicle OFF (LOCK) mode
   	Secondary HO2S (Sensor 2) 4P connectors: disconnected
   Test point 1	Secondary HO2S (Sensor 2) 4P connector No. 3 and No. 4 (secondary HO2S (Sensor 2) side)
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Replace secondary HO2S (Sensor 2) .

   NO 

   Go to step 5.

5. Shorted wire check (SO2HT line)

   -1. Jump the SCS line with the HDS.

   -2. Disconnect the following connector.

   PCM connector B (51P)

   -3. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Secondary HO2S (Sensor 2) 4P connector: disconnected
   	PCM connector B (51P): disconnected
   Test point 1	PCM connector B (51P) No. 20
   Test point 2	Body ground

   Is there continuity?

   YES 

   Repair a short in the SO2HT wire between the PCM (B20) and secondary HO2S (Sensor 2).

   NO 

   The SO2HT wire is not shorted. Go to step 6.

6. Open wire check (SO2HT line)

   -1. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Secondary HO2S (Sensor 2) 4P connector: disconnected
   	PCM connector B (51P): disconnected
   Test point 1	Secondary HO2S (Sensor 2) 4P connector No. 4
   Test point 2	PCM connector B (51P) No. 20

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The SO2HT wire is OK. Go to step 7.

   NO 

   Repair an open in the SO2HT wire between the PCM (B20) and secondary HO2S (Sensor 2).

7. Open wire check (IG1 (ACG)/IG1 ACG line)

   -1. Turn the vehicle to the ON mode.

   -2. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Secondary HO2S (Sensor 2) 4P connector: disconnected
   	PCM connector B (51P): disconnected
   Test point 1	Secondary HO2S (Sensor 2) 4P connector No. 3
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there battery voltage?

   YES 

   The IG1 (ACG)/IG1 ACG is not open. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P0141 goes away and the PCM was updated, troubleshooting is complete. If DTC P0141 goes away and the PCM was substituted, replace the original PCM .

   NO 

   Repair an open in the IG1 (ACG)/IG1 ACG wire between secondary HO2S (Sensor 2) and the No. C30 (10 A) fuse in the under-dash fuse/relay box.