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P0134 - Bank 1 Sensor 1 Location

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112K views 13 replies 7 participants last post by  CRidge828  
#1 ·
Hello.. I just purchased my Ridgeline about 2 months ago and this is my first thread on here!! Today I was greeted by a "P0134" on my OBD2 reader. From reading on the forum here is says:

DTC P0134 [rear A/F sensor (bank 1, sensor 1)
heater system malfunction]

My question is.. Where is bank 1, sensor 1? Is it by the firewall, front of motor, before or after cat, etc..

Thanks in advance!
 
#2 · (Edited)
See if this helps:

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Image


Image
 
#3 ·
Thanks for the diagram. I had the one diagram, but couldn't find the other one in my manual. From what I gather is the bank 1, sensor 1 is the catatylic closest to the firewall and the sensor closest to the hood. Fortuantely this sensor is the cheapest one out of the bunch:act024:
 
#4 · (Edited)
How easy does it look to get to? I didn't peek under the hood on my RL to check.

Edit: I just replaced the last image... noticed the hand was obscuring the torque value.
 
#6 ·
Man, I can't think of anything I can do to my RL in 5 minutes. Well, ok, I can check the oil in less than 5 minutes. ;)
 
#9 ·
Northernlights... You said it.. I will admit, it took about an hour start to finish. The best way is to work on a cool motor. I spent half the time getting burned.

Take the engine cover off

Unscrew the bracket that is holding the bottom o2 sensor and the top one. By doing this, you can really bend the connector to get it sideways. This is pretty much the only way to unhook the connector. Just doing it in place is close to impossible. BTW, there is only one little tab that keeps the connector on. Once that is depressed, the connector is free to come off. As I said though, you have to turn the connector sideways, makes it so much easier. After trying it 30 other ways, it came off in 20 seconds.

Once un-connected, put your o2 sensor socket on the o2 sensor and take it off

Hand screw in the new o2 sensor and tighten. Make sure the crush washers are on the o2 sensor, as this will keep you from having an exhaust leak

Re-connect sensor

Re-install the engine cover.


This o2 sensor from Honda was about $350 + $50-100 in labor. I purchased a Bosch o2 sensor from Autozone online for $97 shipped plus I received a $15 gift card
 
#14 ·
AutoZone charges $140. I got mine on Amazon for 25 bucks just goes to show how these auto retail shops are gouging. You don’t buy anything at AutoZone get it online by the way I replaced my O2 sensor BANK one sensor one and I still get a P0 134 no circuit activity. Checked pigtails replaced both converters do I have a bad wiring harness?