'03 accord exauto v6 getting a 2237 fault-which sensor is this code referring to????

 

DTC P2237: Rear A/F Sensor (Bank 1, Sensor 1) IP Line High Voltage

Look at this:

http://www.alldatadiy.com/alldata/AFI~G~C40355~R0~OD~N/0/41746505/41746506/41746536/41746537/34853741/34857029/34857030/34857663/122915129/134161611/134184912

 

Hi, I just got the same trouble code P2237 (Autozone said it was AF sensor DIP line high voltage -12, Open or short circuit or Failed AF sensor) - and I'm trying to determine the location of the sensor to determine cause. Could there be an indirect cause for this? I replaced the Air Filter with an aftermarket one about three weeks ago - I am wondering if a) I damaged the sensor/wiring replacing the filter or b) the air flow is now different due to an aftermarket filter difference, resulting in a "fault" condition.

 

I think this is the A/F (aka O2) sensor that you see from top of engine bay close to firewall (not the one in front near radiator).

I too have this code and am working on fixing it but having some trouble.

First, I cannot get the electrical clip disconnected. I push on the tab and pull as hard as I can but nothing moves. I've tried on the front one as well B2S1 even though it isn't bad just to see if I could get that clip off. I've wedged a flathead tip in there and can get a tiny bit if separation but it just goes right back when I release pressure. Is there a trick to disco these?

Second, what part/parts can/should I use to replace it? Can I use a Bosch 15730 4-wire O2 sensor even though this is a 5-wire A/F sensor? Do I then just combine the black/ground wires? Can I use a Bosch 15401 OE sensor? Or do I need a sensor from Honda?

Third, I can just use a 3/8" wrench to remove sensor, right? No need for an O2 socket.

Thanks for reading and hopefully responding!
-Kaell

 

The location of the sensor depends on the year of the car, and whether 4-cyl or V-6...??
You won't want to use a generic sensor with the wrong number of wires.

 

Same as OP. 2003 Accord EX V6 Auto. I'm fairly certain on the location for this car for B1S1.

I think I'm going to go with the Bosch 15401.

 

Denso seems to make the sensors for Honda. I haven't used Bosch & don't know their part numbers.

Sensor 1 is at the top of each catalyst, against the head. Sensor 2 would be below each catalyst. But I'm not sure of the numbering of bank 1 vs bank 2.

It might be in there pretty tight, so a normal wrench might not cut it. If the wire fits through a closed-end wrench, go for it. An open-end wrench might round off the sensor hex.

 

On the six cyl, bank 1 is on the back side of the engine