"http://engine-codes.com/uploads/honda/00-046.pdf"

This TSB says to check the ECU part number and if that's OK then swap out the O2 sensor.

My guess is that the $50 O2 sensor is the wrong one.

Need a bit of info....trying to verify the car and the part put into it.

What is the 8th digit of the VIN?

What was the part number of the O2 installed?

Oh, there is this VIN Decoder thing at the top of this section...try that but at the same time I'd like to still know the 8th digit.

8th digit is 8

Denso 234-4621 is the part I got from amazon

That is the right downstream sensor. I think P1164 indicates a problem with the upstream sensor: sensor 1, primary O2 sensor.

P1164 just came about last week though. And could you put that in laymen's terms please? Sorry!

Looking back:After that it popped a P1164 as I recall. I'm just trying to follow the sequence of events.

The Densor part number for the replaced sensor is a replacement for the secondary O2 sensor as far as I can tell from the RockAuto website. The sensor after the cat. The original codes - P1166 and P1167 - point to problems with the primary O2 sensor, the sensor in the exhaust manifold. So does P1164.

I've heard about non-ULEV primary O2 sensors throwing CELs when installed on a ULEV (F23A4) engine, so I assumed that your friend put the wrong sensor in. Maybe he just mistakenly replaced the secondary O2 sensor with the right one and the original problem, a bad primary sensor, remains.

Your friend would have had to replace the secondary sensor from underneath the middle of the car whereas the primary sensor is replaced from the engine compartment. Which sensor did he/she replace? And do you have the F23A4 engine? I think that's what Poorman was getting at when he asked you for the VIN's eight digit. The engine number should be on a label on the upper timing cover: F23A4 or F23A1. Engine type makes a difference for the primary O2 sensor.

Those codes are related to the air-fuel ratio sensor circuit (e.g. P1166, P1167, etc.) , those are not the codes for a regular narrow-band type O2 sensor. The problem is probably replacement with the wrong type sensor or wrong location. The car is probably a ULEV.

Regular O2 sensor trouble codes are different.

you got the wrong denso part bud.

is the one you need per Denso's part finder http://www.densoaftermarket.com

Roader- the 1164 code showed up for the first time last week when I got the code pulled. When it was pulled in mid-June, it was not showing up.

And he replaced it from the engine compartment, so I'm guessing he just replaced the right sensor with the wrong part. I have a ULEV Engine so I'll probably need to get the $130 one and it will all be good?

I had the same problem, I have owned my 2002 Accord 4cyl for 5 years and a week after I bought it the engine light came on. It has been on ever since, I had it checked out by a mechanic and it turns out that there is a pin hole in the charcoal filter.
The area I live in we do not have to do emission tests so I was told not to worry about it because it will not effect the car.

Hope that helps!