My CR-V 2005 ( 190,000 miles) got a CEL on ( Nov, 2014)( Colorado). Dealer’s scan showed code: P0139 : O2 sensor 2( down stream) slow response( Dec,11,14). I took my car to a shop close to my house for replacement of O2 sensor. After replacement, the mechanist told me, my sensor( new) " still stuck …

Have the fuel pressure check when the tank is low 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 le…

if your catalytic converter was that bad, you’d have P0420 catalyst low efficiency code. The downstream sensor would be fluctuating at the same rate, or nearly, as the upstream sensor I’m very skeptical of the cat diagnosis. I think the mechanic is headed down the wrong path One more thing . . .…

The engine computer monitors the O2 sensor before the cat and the one after the cat and compares the readings. They should vary w/time in a certain way w/respect to each other. It sounds like the one after the cat isn’t doing what the computer thinks it should be doing. A full rich reading could …

Hi knfenimore, db4690, GeorgeSanJose, Thank u all for giving me the ideas. I’ll check the tank pressure & Upstream O2 sensor. My New O2 Sensor ( downstream) is made by NTK ( japan) . This morning, with gas tank is just half, my CEL is still off, I fill the tank up. Guess what: CEL is ON!!! I che…

@tracdaubac If you filled up and the check engine light is on, it’s almost certainly not because of the catalytic converter Best get the codes read again . . . might have a different code by now Your mechanic is giving you just plain bad advice, in my opinion If he knew how to check mode 6 data, …

Code P0139 of Honda CR-V 2005

Maintenance/Repairs

knfenimore January 30, 2015, 5:24am 2

Have the fuel pressure check when the tank is low
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 may be faulty
Exhaust gas leak

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Code P0139 of Honda CR-V 2005

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