I got a P0037 code which is the Bank 1 Sensor 2 O2 sensor. What I need to know is exactly how do I get to it. I know that it is roughly near the firewall on the drivers side but how do I get to it. Under the car? Do I have to take other parts off to get to it? Any help appreciated.
Regards,

Mfdpa.

Hi mfdpa,

I think you mean code P0137, which is Bank 1 Sensor 2. This is the after cat heated O₂ sensor on the firewall head. This is an easy replacement, although a stealership will likely charge you $50-$100 labor, plus huge $$$ for a Denso sensor when the aftermarket Bosch is cheaper and most likely superior in design.

If you pull your van up on ramps, you can slide under and find this sensor. It's located right above the exhaust 'Y' pipe where the 2 heads are exhausted together. If your van is AWD, the rear driveshaft will be partially blocking your view; this is not a problem, you can still reach it. Now, you will notice that just after leaving the sensor, the wire is clipped to the undercarriage (to keep it from snagging on the road, rear driveshaft, etc.) and then it goes through the sheet metal near the left front tire via a grommet. Gently pry the plastic wire clip out (use a small screwdriver) and try to save it for use on the new sensor; it's designed much like a toggle bolt and held to the wire with a short zip-tie, which is easily removed once the old sensor is out. The wires then go through the grommet and reappear inside the passenger cabin. Open the driver's door and put the driver's seat all the way back to give yourself some room. Now, remove the small plastic kick panel immediately to the right of the accelerator pedal. It has one push clip near the firewall and 2 hidden edge clips where it connects to the main console kick. Remove the push clip and disconnect the 2 hidden edge clips by gently pulling the small panel toward the firewall. Once the kick panel is out of the way (you may need to pull the edge of the carpet back a little) you'll see the other side of the grommet. The connector pigtail is just above the grommet (you may need to twist your head up in there to see it, but follow with your fingers - it's there, mounted to the metal console frame). Gently disconnect the pigtail but pushing the lock. Now push the grommet, wire and pigtail through to the underside. Turn out your old O₂ sensor (7/8" open end wrench works well, if not seized from heat) and your old sensor is out. Installation is the reverse procedure. Don't forget to put anti-seize on the new O₂ sensor threads (if not already on from the factory), and to untwist the wires after you turn it in.

Good luck!

Shrewsbury

Just wanted to say that Shrewbury's instructions were exactly right and it took less time to replace than it did to go pick up the part. It was also less than half the cost.

I do not have ramps but I could easily reach it by driving the driver's side front wheel up onto the curb next to my driveway.

Thanks again.