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Discussion Starter #1 (Edited)
Hi,
My 01 sporty got a P0141 code, and it has something to do with the rear O2 sensors.
Where is the rear O2 sensor? is its fuse in the fuse box under the O2 marked (down)?
I saw an sensor deep below the front cat, but I cannot access it from above, and cannot disconnect it either. It's a pain. Is that the rear O2 sensor?

I found some instructions on kiatechinfo, but the 1st step is about C211 and C199, I think C211 is on the ecu?, what is C199 then, where is C199

Please help me!
 

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Caribou, Otter, Buffalo
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Possible causes
- Faulty Rear Heated Oxygen Sensor Bank 1
- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks
- Exhaust gas leaks

Tech notes
Replacing the rear O2 Sensor bank 1 usually takes care of the problem.
When is the code detected?
Current amperage in the rear heated oxygen sensor heater circuit is out of the normal range.

Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible higher than usual fuel Consumption

P0141 KIA Description
The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.
O2 Sensor - Oxygen Sensor

Read more: OBDII Code P0141 KIA - HO2S12 Heater Circuit | Engine-Codes.com
 
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