Code 2 - Secondary 02 Sensor

[Gemini]

I got a code 43 recently which but that went away. Well, this morning i was with NightWolf and I was trying to show him my batter flicker problem so I gunned it up and down the street a couple times. The strange thing is no tthe battery light didnt flicker once but I did get a CEL afterwards

I throwing a Code 2 - secondary O2 sensor and a Code 43. The 43 is associated with a bad O2 sensor as ive read but what is secondary O2 sensor? I guess Code 1 is normal for O2 sensor but ive never heard about a secondary O2 sensor Someone enlighten me please.

[Gemini]

bump

[Gemini]

bump...can someone let me know what a secondary o2 sensor is?

[Gemini]

Fuck it, I just took a shot in the dark with google and they explained that a preimart o2 sensor will be in the header(I guess like lx and dx models) and a secondary o2 sensor would be located under the car next to the cat(I guess just like an EX). Seeing that my car is EX it just mean to get a EX o2 sensor

[djcaz_aom]

Okay the Code 2 is another code for the Heater circuit on the O2 sensor.

Code 43 has to do with the fuel system; Check your fuel pressure and the regulator. Also look for any vacuum leaks, as a leak will affect the regulators operation.

[Gemini]

Okay the Code 2 is another code for the Heater circuit on the O2 sensor.

Code 43 has to do with the fuel system; Check your fuel pressure and the regulator. Also look for any vacuum leaks, as a leak will affect the regulators operation.

heater circuit? I have ni idea what that is.....does that mean to just change the o2 sensor?

How do I check the fuel pressure and reglator? Iwill check for vacuum leaks tomorrow.

[djcaz_aom]

Yeah the O2 sensor has 4 wires. Hot, Ground, and 2 for the heater circuit.

You will need a fuel pressure gauge, and a hand held vacuum pump with gauge.


-Hook up the gauge to the banjo bolt on the driver's side of the fuel rail. Start the car and check for leaks where you put he gauge.

- Unplug the vacuum hose that goes from the regulator to the plenum at the plenum and hook up the vacuum pump to the plenum. Make there is vacuum. If no vacuum, check to see if something is blocking the nipple from getting vacuum.

- Plug the hose back up, and unplug the end on the regulator. Apply vacuum with the pump. Look at the gauge. It should show a decrease in pressure as you apply more vacuum.

Here are the specs:

30-38 psi with the hose attached to the plenum. (35-37 psi for 90 accord)

40-47 psi with the hose dissconnected from the plenum. (35-41 psi for 90 accord)

[benji]

Your car only has one O2 sensor, and it is the same sensor between the models. The only thing that changes is where its placed in the exhaust.

I would disregard the 43 until AFTER you replace the O2 and clear the ECU codes. I know it says fuel supply system, but most everybody who has ever had this code has had an O2 problem at the same time, and fixing the O2 fixed the 43 code.

[Gemini]

Your car only has one O2 sensor, and it is the same sensor between the models. The only thing that changes is where its placed in the exhaust.

I would disregard the 43 until AFTER you replace the O2 and clear the ECU codes. I know it says fuel supply system, but most everybody who has ever had this code has had an O2 problem at the same time, and fixing the O2 fixed the 43 code.

Gracias Senor