http://www.bing.com:80/search?q=P0139+O2+SensorSearch resultshttp://www.bing.com:80/s/a/rsslogo.gifhttp://www.bing.com:80/search?q=P0139+O2+SensorCopyright © 2026 Microsoft. All rights reserved. These XML results may not be used, reproduced or transmitted in any manner or for any purpose other than rendering Bing results within an RSS aggregator for your personal, non-commercial use. Any other use of these results requires express written permission from Microsoft Corporation. By accessing this web page or using these results in any manner whatsoever, you agree to be bound by the foregoing restrictions.https://www.driveaccord.net/threads/cel-p0139-10-months-after-last-p0139-downstream-sensor-was-replaced.554429/Well, P0139 has come back yesterday and remained on today. Original O2 sensor replaced Dec.10/2019 - NGK P0139 code came on/went off about 8 weeks ago. P0139 came on again, yesterday. Used an OBD2 reader to check values, if this means something to anyone: 7.81 short term fuel % trim bank 1 4.69 long term fuel % trim bank 1Fri, 17 Apr 2026 05:14:00 GMThttps://www.driveaccord.net/threads/is-it-safe-to-ignore-this-p0139-code.561519/The code P0139 is a slow response on the secondary O2 sensor, a lot of times the heater is not working properly. It is not getting heated up enough to give a good signal.Tue, 14 Apr 2026 11:29:00 GMThttps://www.driveaccord.net/threads/p0139-and-replacing-the-downstream-o2-sensor.346874/At 303k miles I had a check engine light and read code P0139: I cleared the codes, and after 3k more miles, I still had no check engine light. However, since I have >300k on the o2 sensor, I decided to change it anyway. It is a pretty simple exercise, but I included some pictures below...Fri, 10 Apr 2026 11:05:00 GMThttps://www.driveaccord.net/threads/p0139-and-p0420.579366/I got a CEL on my 2009 Honda accord manual ex 2 door. About a month ago it came up and it was p0139 for the o2 sensor reading slowly. cleared it then it came back last week and now it shows p0420 and p0139. took it to my mechanic and he said it needs a new cat and just changing the sensor is a...Sat, 18 Apr 2026 07:00:00 GMThttps://www.cadillacforums.com/threads/97-etc-code-p0139.1153870/Detailed Description of Error P0139 OBDII error code P0139 is a generic trouble code that indicates a problem with the oxygen sensor circuit in Bank 1, Sensor 2.Fri, 03 Apr 2026 08:08:00 GMThttps://www.driveaccord.net/threads/2013-honda-accord-p0139-ho2s-s2-slow-response.556334/Hello, I have a 2013 Honda Accord EX-L 2.4 L 4 cylinder CVT with 162,000 miles on it. Recently I am getting the Check Engine/Malfunction Indicator Lamp light with the following code: P0139 HO2S S2 Slow Response I clear the code and it takes 2 days and it shows up again. What would be the best...Sat, 18 Apr 2026 13:19:00 GMThttps://www.driveaccord.net/threads/p0139-and-p0420.579366/page-2I got a CEL on my 2009 Honda accord manual ex 2 door. About a month ago it came up and it was p0139 for the o2 sensor reading slowly. cleared it then it came back last week and now it shows p0420 and p0139. took it to my mechanic and he said it needs a new cat and just changing the sensor is a...Wed, 15 Oct 2025 16:58:00 GMThttps://www.driveaccord.net/threads/cel-p0139.15548/P0139 - Oxygen Sensor Circuit Slow Response (Bank1, Sensor2) I am also having this issue. My check engine light comes on sporadically and the code P0139 has been stored in memory for a long time now. It has been coming on for the past 100k MI (I have 217,000 MI now).Fri, 13 Mar 2026 09:23:00 GMThttps://www.driveaccord.net/threads/throwing-a-p0139-code-please-help.380097/I get it scanned at autozone and it comes up with code P0139 which says "Oxygen Sensor Circuit Slow Response (Bank1, Sensor2)". I search and see that this is the rear, lower o2 sensor.Sun, 12 Apr 2026 21:33:00 GMThttps://www.driveaccord.net/threads/cel-p0139-10-months-after-last-p0139-downstream-sensor-was-replaced.554429/page-2Scenario: 100% city driving. CEL on for 3-4 days (P0139) CEL off for 3-4 days Been going for months, likely since late Oct.2020. Note: downstream O2 sensor replaced Dec.2019 (NGK) He recommended the following in order: 1. He came across the Honda TSB 14-001 (I knew about that TSB already, but didn't want to cloud his opinion).Fri, 20 Mar 2026 02:12:00 GMT