crf450r

Getting the P1167 code on my 2001 Accord 2.3 (F23A4 engine). I swapped out the original O2 sensor for a Bosch Universal (#15734) and reset the MIL light. Thought the problem was fixed but MIL light came back on about 2-3 minutes into the test drive. When I start the car the heater circuit registers 14v for a couple seconds then drops to 11v and stays there. Has anyone successfully used the Bosch 15734 in this engine? Any other ideas? Before I clipped the wires on the original sensor I was getting good voltage fluctuations, from .15 to .95 so I think just the heater was cooked. Is there a fuse or something upstream in the heater circuit that is prone to failure?

qtiger

If the heater was dead on the old O2 it would have fouled very quickly. How did it look when you took it out?

crf450r

I've attached pictures of the O2 sensor.

98CoupeV6

Next time post stuff like this in the accord forum. This has nothing to do with the O2 sensor, this is the A/F sensor in the exhaust manifold

DTC P1167: A/F Sensor (Sensor 1) Heater System Malfunction

NOTE: If DTC P1162 is stored at the same time as DTC P1167, troubleshoot DTC P1162 first, then troubleshoot DTC P1167.



Reset the ECM/PCM.
Start the engine. Wait for at least 80 seconds . Is DTC P01167 indicated? YES - Go to step 3. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at C102 (located under the under-hood fuse/relay box), the A/F Sensor relay, the A/F Sensor (Sensor 1), and the ECM/PCM.
Disconnect the A/F Sensor 4P connector, and ECM/PCM connector C (31P).







Connect ECM/PCM connector terminals C14 and C15 to body ground with a jumper wire.







Check for continuity between A/F Sensor (Sensor 1) 4P connector terminal No.1, No.2, and body ground individuality. Is there continuity? YES - Replace the A/F Sensor (Sensor 1). NO - Repair open or short in the wire between the A/F Sensor (Sensor 1) and the ECM/PCM (C14 or C15).

qtiger

The O2 sensor is the A/F sensor.


That sensor looks good. I can't believe that the heater on it is dead.

98CoupeV6

Kind of. The O2 sensor controls how much fuel is injected into the cylinders, but on the F23A4 there is what Honda calls an 'A/F sensor' on the exhaust manifold that controls the A/F ratio differently and makes sure it is correct for emissions purposes. They're a little different, which is why Honda calls them by different names. But yeah, the terms are generally interchangeable and on everything except the F23A4 it's an O2 sensor. Observe:



In any event, he probably got the CEL because he bought an aftermarket O2 sensor and not the correct Honda A/F sensor.

mberndt

You are confused...
In Pre-OBD and OBD-1 cars, 1 oxygen sensor is present, before the catalytic converter, and in OBD-2 and later cars, there are 2 sensors, 1 before and 1 after the cat.
All computerized engine management systems use an Oxygen sensor to detect the amount of oxygen in the exhaust stream, and then use the value of the resistance to determine the proper fuel and ignition timing.
An O2 Sensor is exactly what it says it is, there are no differences...
An A/F ratio is what is being read off of the O2 sensor, it determines the correct mixture of spark and fuel to supply to the engine.
The words are interchangeable no matter what company they come from...
Later

qtiger

They are both O2 sensors. Primary and secondary heated oxygen sensors. And, as far as I know only the pre-cat oxygen sensor controls fueling. The second one is just there to pay attention to emissions and scream if your cat goes bad.

98CoupeV6

No, you are confused. There is a seperate sensor on the F23A4 that is called the AIR/FUEL RATIO sensor by Honda when it calls all other sensors the Oxygen sensor. I understand what Oxygen sensors do (but thanks for reiterating exactly what I said to sound smart). It is a different part number and different from the other oxygen sensors Honda sells. It obviously must perform a different function and is the reason why his check engine light is on. He might as well have stuck a fork in the hole, the Bosch unit probably isn't helping the PCM because it's incompatible.

I liked how you contradicted yourself too..first you said the O2 sensor reads the oxygen, then you said it reads the air fuel ratio. It doesn't determine spark BTW, it just determines fuel injection.

crf450r

Actually when I pulled the original sensor the 1164 H02S Circuit/Range Performance, 1166 H02S Heater System Electrical, and 1167 H02S Heater System codes were set. With the Bosch 15734 in there I'm only getting 1166 and 1167.

But guess what I just found out... Stupid racepages.com lists the Bosch 15734 as the universal replacement for my car, right next to a picture of the OEM unit when actually the 15733 is what I found on Bosch's own website. I'm not sure why I trusted racepages.com and I bought the sensor from the local Napa shop so I have no real recourse against racepages.com. I guess I'll give the 15733 a shot. Even after buying both the 15734 & 15733 it'll still be cheaper than OEM. If the 15733 doesnt' work then Bosch can refund my money.

Thanks for all the help.