2.5 V6 oxygen sensors problem

768 Views 7 Replies 2 Participants Last post by chase206, 11 mo ago

Scxx

Discussion Starter · May 9, 2022

Hi everyone
Can anyone help me to find what 02 sensors should i use on my 2,5 v6 gls 2001 sonata? I know its not a tiburon but i cant find the answer anywhere. I know there are two types off oxygen sensors used one is titanium the other is zirconium and they have diferent wiring plugs and diferent voltage outputs. But i dont know if the 2,5 uses only one or both types as tiburon. My 02 wiring and plugs have been butchered by 1000 mechanics and i cant count on them if they are the ones that came from the factory,When i bought the car the o2 wiring was all wrong and the + and - for heating circuit was wired to the signal and signal groud on the 02 sensor and vice versa on both sensors. I figured the right wiring and rewired it corectly.

I bought new 02 sensors they are the old titanium type 0-5V (Bosh 0258986602 universal sensors without plugs) i dont know whether they will work with my car. The old sensors were also the titanium ones which probably broke because of the bad wiring, My engine only have the upstream sensors the downstream are not present in this engine.

Please if anyone can help me I will be very grateful. I need to know what sensors to use and what is the right wiring plugs for my car, because our Eropean emision standarts are wery high and you cant have the slightest error int the emisions otherwise you wont past the test.

The photo i posted is what my wiring looks like.
Sorry for my bad english im from Slovakia.

Camera accessory Line Bicycle part Tool Font

Cylinder Auto part Automotive lighting Machine Gas

See less See more

Save

1 - 8 of 8 Posts

chase206

· #2 · May 9, 2022

You almost have the correct 0-5v O2 sensors. You will need a known OEM brand such as NTK, Denso or Mando brands. Generic sensors will not work correctly with our Siemens ECUs unfortunately. Even a reputable brand like Bosch will not perform well and often lead to heater circuit CELs. If the pinout differs, this is the first I've heard of it. Can you provide your VIN number? Maybe we can help track down the correct sensor if the connection differs.

I believe your ECU is the Siemens 5WY12 with 2mbit EEPROM variant which is very similar to the Tiburon's 5WY15 variant which requires the titanium style 0-5v sensors.

Save

Scxx

Discussion Starter · #3 · May 10, 2022

chase206 said:
You almost have the correct 0-5v O2 sensors. You will need a known OEM brand such as NTK, Denso or Mando brands. Generic sensors will not work correctly with our Siemens ECUs unfortunately. Even a reputable brand like Bosch will not perform well and often lead to heater circuit CELs. If the pinout differs, this is the first I've heard of it. Can you provide your VIN number? Maybe we can help track down the correct sensor if the connection differs.

I believe your ECU is the Siemens 5WY12 with 2mbit EEPROM variant which is very similar to the Tiburon's 5WY15 variant which requires the titanium style 0-5v sensors.

Hi thanks for your answer. Didnt know that bosh wont work with my ecu.
My VIN - KMHEN41EPYA177529
Here are photos of my wiring

Automotive tire Finger Motor vehicle Gas Coil

Hand Automotive tire Tread Communication Device Finger

Sensitive content, not recommended for those under 18

Show Content

Watch Automotive tire Automotive lighting Finger Nail

Automotive tire Hood Motor vehicle Automotive fuel system Tread

See less See more

Save

chase206

· #4 · May 10, 2022 (Edited)

Your VIN number comes back as a 2000 model year, manufactured in 1999:

Date of Manufacture: 19990825
: 2000
Model: DAFGV65
Country: [C04] DENMARK
Region: [C51] EUROPE

Interestingly it comes up as a "SPEED DENSITY" car which means you don't have a MAF sensor? This is the first time I've heard of a Delta 2.5L with a MAP sensor so that's a cool find! I've been looking for ECUs from either the 2.5L or 2.7L that were MAP based... Do you have access to any EU spec ECUs with MAP sensors by chance?

[2GB] FUEL PACKAGE(UNLEADED)
[3LA] EVAP. GAS CONTROL EQUIPMENT
[3LC] EMISSION(EC 96 UNLEADED)
[3GY] UNDER COVER-BATTERY
[3AC] BATTERY-68AH
[3NA] SPEED DENSITY

In the US a 1999-2001 Sonata 2.5L would accept the following sensors in the upstream locations of both banks.

(Short pigtails)
NTK 25000
MANDO 18A1404
DENSO 2344431

The downstream sensors are the same sensors but with longer pigtails. On the Tiburon some of the 2mbit cars with 5WY15 ECUs only had two O2 sensors in Korea, Australia and supposedly Germany... One sensor was close to the head of bank2 and the other was further downstream near the catalytic converters. If one sensor has a longer pigtail, try one of the following downstream sensors with the longer pigtail instead for bank1:

(Long pigtails)
NTK 25166
MANDO 18A1403
DENSO 2344432

See less See more

Save

Scxx

Discussion Starter · #5 · May 11, 2022

Thank you for your answer. I definetely have MAF sensor. Its kind of strange...maybe someone did an engine swap on my car?
I can look around in our Slovak market for some MAP sensor ECUs but those cars are wery rare in here probably like 4 of them in the whole country

Now i need to know if my engine was originaly in my car to know what sensors to use.
Do you by any chance know what the zirconium plugs looks like? Or how i can identify my engine?
You were very helpful,

Save

chase206

· #6 · May 11, 2022

Interesting! I wonder why it claims to be a speed density tune from the VIN number. Maybe that's a mistake on the VIN lookup application and it's actually a mass air tune.

Take a picture of the main label of your ECU. If it says 5WY12 or 5WY15 just below the Siemens logo you will know it requires a 5volt titanium style O2 sensor. The ECUs with 5WY17, 5WY18 or 5WY1F on the label will require 1volt zirconium O2 sensors. Here's an example of the Tiburon 5WY15 and 5WY17 labels:

I don't believe there is a difference in the harness connector so they're easy to confuse.

See less See more

Save

Scxx

Discussion Starter · #7 · 11 mo ago

chase206 said:
Interesting! I wonder why it claims to be a speed density tune from the VIN number. Maybe that's a mistake on the VIN lookup application and it's actually a mass air tune.

Take a picture of the main label of your ECU. If it says 5WY12 or 5WY15 just below the Siemens logo you will know it requires a 5volt titanium style O2 sensor. The ECUs with 5WY17, 5WY18 or 5WY1F on the label will require 1volt zirconium O2 sensors. Here's an example of the Tiburon 5WY15 and 5WY17 labels:
View attachment 138138 View attachment 138139

I don't believe there is a difference in the harness connector so they're easy to confuse.

Hi thank you for all your help and sorry for this late reply, I have been wery busy last two months and didnt do anything with the car. Yesterday i took picture of my ECU and it is 5WY1204C and it should use the 5V o2 sensors. Do you by any chance know the OEM numbers for the 02 sensors?

Save

chase206

· #8 · 11 mo ago

According to RockAuto your 2000 Sonata 2.5L 5V O2 sensors are as follows, which I believe are the same for the early 2MBit Tiburons manufactured before Jan 31st 2003 with the 5WY15 ECUs:

NTK 25000 {392103712A, 392103716A} Info
Fits Upstream Left; Bank 2 Sensor 1; Actual OE Part
or Upstream Right; Bank 1 Sensor 1; Actual OE Part

NTK 25166 {3921037140, 3921037145} Info
Downstream Right; Bank 1 Sensor 2; Actual OE Part

NTK 25169 {3921037180, 3921037185} Info
Downstream Left; Bank 2 Sensor 2; Actual OE Part

OR

MANDO 18A1404 {3921037160, 3921037165} Original Equipment Info
Fits Upstream B1S1, B2S1
or Downstream Left B2S2

MANDO 18A1403 {3921037140} Original Equipment Info
Downstream Right B1S2

OR

DENSO 2344431 Info
Fits Upstream B1S1, B2S1
or Downstream Left B2S2

DENSO 2344432 Info
Downstream Right B1S2

Stick to only OEM brands for best results. NTK, Denso and Mando are acceptable brands for the O2 sensors. If you try other brands, even a reputable one like Bosch, you will encounter problems. I always recommend NTK because they are the OEM brand for US cars, but Mando was also used in other regions. Denso is only recommended if you can't find NTK or Mando in your region.

See less See more

Save

Reactions: 1

1 - 8 of 8 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.

2.5 V6 oxygen sensors problem

Scxx

Attachments

chase206

Scxx

chase206

Scxx

chase206

Scxx

chase206

Top Contributors this Month