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If TechII is so expensive, how come Autozone can pull codes? You need a CAN-bus scan tool to access. Tech II is to AutoZone code reader as Cray.

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So I got a check engine light a week ago. I went to autozone to have them hook up the scan tool for me (A very nice free service). The guy even printed out the diagnostic for me. P0037 - 'heated 02 sensor bank 2 sensor 1' (WRONG as you'll find out in a minute). So I bought at 02 sensor (cheap wire-it-yourself from ebay).

I chopped the harness below the blue connector on the front of the motor. I spliced the new 02 sensor in and installed it and thought I was fine.

In the meantime I decided that I was tired of going to autozone for the code reading and found a nice one on amazon.com that I ordered. It came today.

I cleared the codes and went for a drive..NUTS. 15 minutes later I had a check engine light again. I got back home, checked the codes.

P0037P0154P1168 So my codes are having babies now. This code reader asks you to type in the make of the car before giving you the diagnostic on each code.

This time I got:P0037 - 02 heater bank 1 sensor 2. P0154 - 02 sensor bank 2 sensor 1. P1168 - Closed loop bank 2.

So what happened??? Well, I had bad info on the code and didn't do my homework properly. P0037 is actually bank 1 sensor 2.

But the code and printout I got at autozone had it flipped. Mikroc Serial Interrupt. Said it was bank 2 sensor 1. Stasi Liste Download there. So I ripped out a perfectly good 02 sensor and replaced it incorrectly. My ebay special was a 4 wire and the sensor i replaced was a 3 wire. I thought I wired it correctly, but didn't. The P1168 should go away on it's own since the closed loop diagnostic requires the 02 sensor to work properly.

It'll be fine when I'm done. The P0037 is a 4 wire sensor and will work perfectly with the ebay sensor I bought. I'll rewire the one I took off the car.

Thankfullly I didn't throw it away. I've learned that much in my days of wrenching on cars. So, the moral of the story. If you get your check engine code read at a car parts store. It would be wise to double check the code in the FSM from Nissan to be sure of the proper description. If you have the money. It is awesome to have your own code reader.