MattWA

I have a US 2002 Accord EX 2.3L V-Tec ULEV 4speed automatic with 47,000 miles on it.

Last week the CEL came on and threw P1166 & P1167 ODB2 codes.
I went to my local NAPA auto parts and picked up a BOSCH replacement part #15733 primary O2 Sensor. The wire harness on it unfortunately was about 3 inches too short so I couldn't use that. I went back and they sold me BOSCH part #13071 which is the secondary O2 sensor with a longer wire and clip on it.

I installed this and the P1166 code went away but P1167 remains.

My question is, are the primary and secondary O2 sensors different in anyway other than the length of the wire harness? I removed it and replaced it with the original O2 sensor till I figure this out. I've checked all the fuses in the engine compartment and the driver side fuse box and everything checks out.

Any suggestions on how to t-shoot the P1167 Heater System Malfunction? Should I just run it for awhile after replacing the primary O2 and see if it goes away?

Also, I bought the car in California and now live in Washington state. My motor is the F23A4 type. I am reading there may be a difference in the O2 sensors between these models. Narrowband and wideband? Is this true and are the BOSCH part #'s above not compatible?

Sorry if these questions have been asked before I did search the forums extensively before posting.

Thanks in advance,
- Matt

hondapower80

I would give these guys a call at Majestic Honda. If you look at the diagrams, I think the sensors are different(but don't quote me on that one). The reason is the 02 sensor in the exhaust pipe is 99.46, and the other in the exhaust manifold is 113.35 with different part numbers.

Also, I have never liked Bosch products in Hondas or domestics. They seem to work better in European cars, (ex. VW). I had used Bosch Platinum Spark plugs in a Mystique, and it threw a code and triggered a check engine light. When I switched back to the stock Motorcrafts, the check engine light went away.

http://www.hondaautomotiveparts.com/...HAUST+MANIFOLD


http://www.hondaautomotiveparts.com/...5=EXHAUST+PIPE

P_Adams

If I had the choice I'd use either NGK or Denso O2 sensors (OEM Manufacturers).
I believe Honda carried over their design phylosophy to the 6th gen accords.
Primary Sensor has a heater element (Believe it or not)
Secondary does not.
It appears that both P1166/67 both refer to the primary o2 sensor and/or it's wiring.
I suspect the 1166 went away from you resetting the computer; and the 1167 remains because you've got a secondary sensor installed in the primary location.

P

YeuEmMaiMai

using non oem parts in 02 sensors will usually cause the ECU to throw codes. The ECU is very strict on it's emissions compliance.......

MattWA

Thanks everyone for your thoughts. Having the primary O2 sensor that has a heating element in it would make sense that I still have a P1167 code refering to the heater with the secondary installed in its place. I'm going to replace the primary with an OEM as that seems to be the general consensus in these forums.

Thanks again for everyone's help. It's great these forums exist with so many people helping and contributing.

- Matt

AFAccord

Matt, the primary O2 sensors are different like you said. The Bosch pn you need is 13512, which is the wideband for ULEV engines. The secondary sensors are the same for ULEV and LEV models though.

My personal preference would be Denso since that's OEM like P_Adams stated, but it's also cheaper.

http://www.Sparkplugs.com

The site is a little screwy if you look up a 2002 model, so try a 2000 model to make things more simple.

FunnyVictor86

Denso OEM ULEV Air/Fuel Sensor (before catalytic converter)
Part# 234-9014
$210.81

ULEV sensors are not cheap ... but they are the best ... that price is right off there site

http://densoproducts.com/resultsApp....ctCategoryID=2

AFAccord

It's actually PN 234-9025.

AIR/FUEL SENSOR 234-9025 FRONT; w/ Eng. Code F23A4; $115.73

FunnyVictor86

really thats odd ... it doesnt come up when i put the make/model info in the search ... but if i just search its part number it pops up ... i wonder what the difference between that one and mine are ...

*edit*

i think theres a difference between models ... EX/LX ... because when i search EX that 234-9025 doesnt show up ... only when i search LX ... whats the difference between EX and LX o2 sensor wise?

paradigm_shift

ULEV models were only available in an EX trim from 2000-2002. Try searching for "2000" model F23A4 on that site, and the correct results come up.

FunnyVictor86

oh i see i didnt know that, thanks

MattWA

Thanks guys for the part numbers and URL's. I went ahead and ordered PN 234-9025 after ordering the wrong one from my local honda dealership for $200. I even told them it was a ULEV! It came in and the wire lead again was too short. If it wasn't for you guys I would have paid out the a**.
Thanks!
- Matt

MattWA

Crap now after I've ordered it I am looking closely at the two part numbers 234-9025, and 234-9014. The picture for 234-9014 looks exactly like the denso sensor in my car now as it has the holes in it and the other doesn't. I wonder if I should cancel and order the more expensive one.

mister_two

MattWA, any luck with the oxygen sensor? I have a 2000 Accord SE and I am getting the same P1166 and P1167. I purchased the Denso 234-9025 and I am still getting the CEL. I did not compare the new and the old sensor very closely. I will remove the new senosr and take a closer look to compare the two sensors.

AFAccord

I don't believe your SE model has the ULEV motor. If that's true, then 234-9025 is the wrong sensor for your car.

mister_two

Just got back from the parking lot here at work and here are my findings:

Old sensor that I removed reads this way on the sensor itself: DU1 Denso 192400-1000 01B06 001 Two black wires, one white and one green wire.

The new sensor that I purchased, part number Denso 234-9025 reads:
Denso Japan 3400 05K09 002 Two black wires, one white and one BLUE.

The engine reads ULEV VTEC. F23A4.

I also read Pooter05's very thorough thread title 2002 Honda Accord SE 02 Sensor Issue, (thanks, by the way). According to him I need denso part number 234-9014.

Both sensors look almost identical, save the blue and green color wires. Both are the same length. One sensor has a slightly narrower diameter where the wires go into the sensor. BTW, the 9014 Denso cost about $100 more than the 9025 denso

paradigm_shift

Evidently 2000 model ULEV Accords use Denso p/n 234-9025, and 2001-2002 model ULEV Accords use Denso p/n 234-9014. Who'da thunk it? This just makes parts buying from auto stores more difficult because no one has all the right info in one place like the stealership.

Part #9 in the links below...


2000 EX ULEV
http://www.hondaautomotiveparts.com/...OLD+%28ULEV%29

2000 SE ULEV
http://www.hondaautomotiveparts.com/...LEV%29+%283%29

2002 EX ULEV
http://www.hondaautomotiveparts.com/...OLD+%28ULEV%29

Pooter05

Mister Two -- check this out: http://www.densoproducts.com/results...ctCategoryID=2

That page will bring you directly to the Denso page showing the part numbers for the O2 Sensors. You need the 234-9025 not the 234-9014. The 2002 uses the 234-9014.

O2 Sensors are fragile. Did you by chance drop it or hit the tip on anything during installation? Have you checked your fuses? I would think the fuse layouts on the 2000 and the 2002 would be the same -- #6 on the passanger side interior fuse box is the LAF Heater fuse. Check that out.

However, I did speak to Denso Technical Support and they said that both of those part numbers can be interchanged -- I wasn't willing to try for a 3rd time and it not work though so I went with the 234-9014 like I was told to do by my parts listing.

Call them if you'd like: 1-800-366-1123.

mister_two

Pooter05, thanks for chiming in, I was hoping you would see this thread. . I spoke to a lady at monarchproducts and she looked it up and told me the correct p/n is 234-9014, despite what the densoproducts.com website show. I just called the 800-366-1123 to reconfirm. The technical support guy also said it's 234-9014. I told them my model, 2000 Accord SE with ULEV VTEC and F23A4 engine code. He told me to go to another denso website, densoaftermarket.com, go to "find a part" at the top, then drill down to my car and it says, 234-9014.

One curious thing about 234-9014 and 234-9025, if they were interchangeable why does one cost $100 more?

Pooter05, if you can do me one favor and check the 4 wire colors of your 234-9014 sensor maybe that will help to clear up this mystery. Is it 2 black and one white and one blue or 2 black and one white and one green? Or perhaps it's another color all together. In the meantime I will double check the LAF heater fuse. I remember I checked it once when the CEL light first came on months ago.

I really need to clear up the CEL since my inspection is due at the end of this month.

mister_two

One more thing, I was careful with the installation of 234-9025, since I did read the instructions about the fragility of the sensor. I did touch the tip of the sensor but I used a tissue to wipe it down clean.

Pooter05

Mister Two - I just went to confirm the wire colors -- there are 2 black, 1 white and 1 blue. I have no idea why Denso says they can be interchanged or even why there is such a price difference between the 2. I wasn't taking the risk. I went with what I researched and it turns out I was correct with the one I chose. Apparently, 2000 - 2002 ULEV VTEC F23A4 engines require the 234-9014. Go figure.

If the LAF Heater fuse is good, chances are that 234-9025 and 234-9014 are not interchangeable on the F23A4 and apparently, Denso made a mistake by stating that (it happens). They look identicle but evidently they are quite different somehow.

mister_two

Thanks for checking Pooter05. I was hoping you would find the green instead of the blue. Oh, well. Maybe blue/green doesn't mean much, who knows. I will ship the 9025 back tomorrow and wait for the 9014. I really hope 9014 fix the darn light.

Will report back when I have more info.

Pooter05

Did you get the new part yet and try it?

mister_two

I just UPS the 9025 back to monarch products this morning. I probably won't get the 9014 till the end of this week.

mister_two

9014 sensor came today. I was going to wait till tomorrow - daytime - to install it but we are suppose to get a snow storm in NYC tomorrow so I installed it in my driveway. Installed the sensor and unhooked the battery for a few minutes to reset the CEL. Voila, no more CEL :-) Yeah !! Thanks for all the assistance from this forum.