07-up MINI Cooper/Cooper S (R56)
Sponsored by:
Sponsored by:

DTC for Heating Circuit of Downstream O2 Sensor

  #1  
Old 07-30-2018, 08:24 AM
Junior Member
Thread Starter
Join Date: Apr 2017
Location: Houston, Texas
Posts: 8
Default DTC for Heating Circuit of Downstream O2 Sensor

My 2010 Clubman S has 110,000 miles on it. The car always starts up immediately; runs great; gets good gas mileage; and drives very well. The car has very good power. Never misfires. The turbo functions well. The engine does use a quart of oil in about 1,200 to 1,500 miles. Yes, I know that my Clubman is an R55, but I figure there are more people who use the R56 section who may have answers.

But I cannot get rid of the "check engine light". Only one code shows up: The Heater Circuit for the Bank 1, Oxygen Sensor 2 has a fault. My scanner gives a factory code of 2A53. Auto parts stores get P0036. When I got the car, it had, I think, a Bosch 7-548961-80 sensor, but who knows how much mileage it had on that sensor. So I replaced it with a cheap after-market O2 sensor. The light still came on after maybe 50 miles, which was worse than the original one. Somewhere I read that NTK sensors worked well, so bought a 25198 sensor and installed. The CEL came on before I got out of the driveway. Same code 2A53. Over time, I have erased the codes quite a few times as I tried different possibilities. Seems the problem is happening more frequently lately.

To test the heater circuit, in installed a 12 V. test light onto the two white wires in the harness. Upon starting the engine, the light flashes on and off repeatedly, and occasionally stays on for a while. From this, I am thinking the wiring to the heater has continuity, and any fuse is OK. So I have the following questions:
1. Surely all three of the O2 sensors are not all bad. But rather something else is causing the problem. Is this logical?
2. Does the heater light coming on, assure that the heating circuit is functioning properly? Should it flash?
3. Which fuse is backing up this circuit? Is it under the hood? Inside the passenger footwell? What amperage?
4. I checked the resistance of the heater within the O2 sensors and all three were about 5.3 to 6.8 ohms. Seems fairly consistent. At least they are not open circuited. Otherwise does this mean anything?
5. Any other advice in order to solve this problem?
Thank you all so much for the help. This is driving me crazy.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Norrirn
07-up MINI Cooper/Cooper S (R56)
0
08-30-2017 11:10 PM
Jethoncho
General Tech
0
05-08-2012 02:33 PM
stevied
General Tech
1
01-12-2009 06:23 PM
touch33
General Tech
0
12-14-2008 05:18 PM


Thread Tools
Search this Thread
Quick Reply: DTC for Heating Circuit of Downstream O2 Sensor


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.