Scud422

I recently purchased a 2000 Accord LX. The check engine light is on, but it runs fine. When I took it to get it smoged, it failed the smog check abysmally and I was told that the check engine light was referring to error codes 1166 and 1167. The internet has informed me that this refers to faulty O2 sensors, one front and one rear. Would fixing/replacing these sensors fix the smog issue? Or should I just try to sell it back to the buyer?

94civicEX

Is the car modified at all?

Scud422

Not that I know of.

94civicEX

Check out this thread - https://www.honda-acura.net/forums/a...ine-light.html

Scud422

Yeah, I read over that thread and that's how I found out what parts the error was referring to, but I don't really know what those parts do and how or if they effect the exhaust and smog.

94civicEX

A faulty sensor causes the air/fuel ratio to change, thus leading to higher emissions and in turn causing you to fail smog.

I would first start by replacing the primary sensor. It is imperative that you get the right one. I would call Honda and give them your VIN, get the part number, then either purchase it from them or online.

Scud422

Awesome, thanks!

gl_eng

this other thread "P1166, P1167 check engine light"
look at
12-21-04, 10:12 PM by ehudson
07-28-07, 03:22 PM by camshaft

There are universal O2 sensors and more expensive ones but you have to know what you are buying. Even the wrong ones will fit the wiring harness but
will throw a code right away.

I have a 2000 Honda Accord SE 4 dr and has --> 4Cyl 2.3L Auto with engine model F23A4 specified as ULEV right on the valve cover
This engine complies with California specs on emissions.
The Vin # will tell you the exact specs of the engine (may need to check around or ask the dealer)
Code throw is P1166 / P1167 Primary HO2S (No. 1) Heater System Electrical / Air fuel ratio sensor
Air fuel ratio sensor is a fancy way for O2 sensor
Read more at: http://www.obd-codes.com/trouble_codes/honda/

Since it is a ULEV (Ultra-Low Emission) engine, it requires a wide band O2 sensor (more $$$) and not the narrow band (which the universal fit may be) sensor.

On this car, I needed to replace the upstream sensor (before CAT) which I got on ebay for $80 from global-automotive in Feb 2012
Honda part : 36531-PAA-307 replacement part : Denso part# 234-9025

if your engine is F23A1, this is NOT the right part.

Do not use the ebay compatiblity listing, I don't believe it is correct, you need to know the engine type such as if it is ULEV
to match the correct O2 wide or narrow bands.

Agucua

The 02 sensor isn't hard to change. don't order one on ebay, just hit up your local advanced auto or nappa for the part..