Outline · [ Standard ] · Linear+ Lambda sensor (O2 sensor), Lambda sensor (O2 sensor)

Hi, everyone. Can someone tell me the exact OEM number for the downstream lambda sensor (O2 sensor) for the Dacia Logan 1.6 2005. 64kW? Engine is K7M-F710 There are a lot of different OEM numbers for this part on the internet, and I am not sure which one is the right.

Hi, everyone.

Can someone tell me the exact OEM number for the downstream lambda sensor (O2 sensor) for the Dacia Logan 1.6 2005. 64kW?
Engine is K7M-F710

There are a lot of different OEM numbers for this part on the internet, and I am not sure which one is the right.

Hi,
please find attached the OE numbers for Logan L90 2005 1.6MPi 64 kW(90CP) engine K7M710 downstream (and upstream) oxigen sensors, but is better to double-check them with your car VIN number.
Greetings.

LE: I added last screenshot, it might be 7700103504, but please check with your VIN (on 2005 cars can be also 6001549061 from the data that I have).

This post has been edited by Gil26: 26 Nov 2022, 19:13

Attached thumbnail(s)
OxigenSensor.png ( Size: 137.62k ) Number of downloads: 370
OxigenSensor2.png ( Size: 284.49k ) Number of downloads: 374

Thank you very much, but I have few questions.

My model is Logan E2 1.6
My motor is K7MF710, does it matter?
I think it's the same as K7M710, except that it can run on both petrol and ethanol.

Also,
should I check ENGINE fabrication number or VEHICLE identification number, because on the pictures is Engine fabrication number?

Thanks.

This post has been edited by moxb: 26 Nov 2022, 19:58

Yes, engine is K7M710 and exhaust system is same.
Based on VIN number you have engine fabrication number and also you can check OE number for downstream oxigen sensor, or you can give \write here car VIN number and me or other collegues can do this for you.
Cheers!

In both cases,
both engine serial number and VIN serial number is greater than 061205.

Based on the images, OEM for the sensor is 6001549061

OK ...

Can you check also OEM 7700875342 ?

It's on the picture also.

This post has been edited by moxb: 26 Nov 2022, 20:56

Thank you very much, but I have few questions.

My model is Logan E2 1.6
My motor is K7MF710, does it matter?
I think it's the same as K7M710, except that it can run on both petrol and ethanol.

Also,
should I check ENGINE fabrication number or VEHICLE identification number, because on the pictures is Engine fabrication number?

Thanks.

I do believe flexfuel vehicles had a wide band oxygen sensor, not same as the one used on gas powered vehicles.

Can you prove this for L90 2005 1.6MPi K7M710 engine please?
(even for 1.6MPi K7M718 Bifuel from 2010 are same OE numbers, see attached)


Attached thumbnail(s)
L90K7M718OxigenSensor1.png ( Size: 150.25k ) Number of downloads: 293
L90K7M718OxigenSensor2.png ( Size: 236.63k ) Number of downloads: 286

I ordered today BOSCH LS602 lambda sensor
https://www.autodoc.co.uk/bosch/1149533

Hopefully, it will work, I'll post results.

Please see attached the procedure for removing \refitting the oxygen sensors, maybe it can help you (or others).
Thank you for any feed-back! (good to know).

This post has been edited by Gil26: 29 Nov 2022, 06:16

Attached thumbnail(s)
OxigenSensor1.png ( Size: 384.75k ) Number of downloads: 269
OxigenSensor2.png ( Size: 710.04k ) Number of downloads: 18
OxigenSensor3.png ( Size: 332.58k ) Number of downloads: 17
OxigenSensor4.png ( Size: 22.59k ) Number of downloads: 15

I have good news and bad news.

I have installed the new lambda sensor that I have ordered and it works fine, but the "Check engine" light is still on.
Problem is that the values on the upstream and downstream lambda sensor are drastically different, and mechanic noticed that the exhaust pipe have a whole and he believes that's the reason.
I will repair that next week and see if it will fix the issue.
Meantime, I have an OBD2 Car Diagnostic tool that I can use to monitor lambda sensor values.
Can someone tell me what are the normal values for upstream and downstream sensor?

This post has been edited by moxb: 2 Dec 2022, 20:30

First fix the hole in the exhaust pipe and then see about "Check engine" light.
(the hole was before, what was the reason for changing the downstream oxigen sensor?)

This post has been edited by Gil26: 3 Dec 2022, 00:35

Diagnostics showed opened circuit (heater) for O2 downstream sensor, meaning broken O2 sensor.
They cleared the fault after replacing O2 sensor, and "Check engine" light is not showinp up anymore, but they told me that readings for O2 sensor are not good (optimal), and when they checked exhaust pipe, they found a hole.
I will patch up hole next week, and measure readings of sensors again.

In this case you might had the fault: DF083 = Downstream oxigen sensor heating circuit, status ET053 =Downstream O2 sensor heating can help when dealing with this fault, application conditions: engine stopped ignition on, status INACTIVE becomes ACTIVE after a period of driving, with engine running at idle speed and engine coolant temperature > 80ºC The status becomes ACTIVE when the engine is started and its operation increases according to the heating temperature. Measure the resistance of the oxygen sensor heating circuit. Replace the oxygen sensor if the resistance measured is not approximately 3.4 ohm at 20°C, or CC.0: Downstream sensor heating on continuously from switching on the ignition: risk of downstream oxygen sensor being irreparably damaged.

Multi-brand programs such as TorquePro or CarScanner are not OK, for diagnosing and monitoring these sensors (but not only) I suggest you use programs dedicated Dacia\Renault, preferably CLiP or at least PyRen or PyClip derivatives.

You might have the following parameters on the diagnostic tool:
- PR099 =Downstream oxygen sensor voltage indicates the computer reading of the voltage across the terminals of the oxygen sensor downstream of the catalytic converter. It is expressed in millivolts. The function of this sensor is to locate faults on the catalytic converter and to perform a second more precise check on the richness (slow regulation loop). This function only starts operating after the engine has been running at normal operating temperature for a while and is not operating at idle speed. When the engine is operating in a closed loop and at stabilised speed, the voltage should vary within the range 500mV < X < 700mV, when the engine is decelerating, the voltage should be less than 200 mV. Do not use the voltage reading on the diagnostic tool when the engine is idling.
- PR098 =Upstream oxygen sensor voltage (only ex with engine stopped and ignition on 400mV < PR098 < 450mV; engine warm and idling 20 mV < PR098 < 840 mV)
- PR438 =Richness correction value represents the average value of richness corrections made by the computer according to the richness of the burnt mixture as detected by the oxygen sensor upstream. The correction value has a nominal value of 128 and limits of 0 and 255: value less than 128: request for leaner mixture, value greater than 128: request for richer mixture. If the voltage sent by the oxygen sensor is incorrect (varying very slightly or not at all) during richness regulation, the computer will only enter defect mode (value =128) if the fault has been detected for 10 seconds. Only in that case will the fault be memorised. If an oxygen sensor fault is present and recognised and if the fault has already been stored, the system enters open loop mode directly. In this case, parameter Richness correction value takes the value 128.
- also maybe PR742 =Additional fuel circuit S.V OCR (for Flex fuel engines only) and command AC262 =Downstream O2 sensor heating.

And regarding how the lambda sensors works I quote from Dacia\Renault:
”Richness is managed using the upstream and downstream oxygen sensors located on the exhaust. For the sensors to be operational quickly, they need to be heated by the exhaust gas and by a resistor internal to the sensor. These sensors reflect the efficiency of combustion and, using information sent to the computer, they enable the quantity of fuel injected to be managed in order to meet the emission control standards and to ensure optimum engine operation. The oxygen sensor is used to achieve efficient performance of the catalytic converter. The richness of the air-petrol mixture provided to the engine must be constant and close to the stoichiometric ratio. For the catalytic converter to operate correctly, the engine management computer must regulate the richness around 1. The richness regulation controlled by the upstream sensor ensures richness 1.
The upstream sensor supplies a voltage according to the image of the average engine richness: the voltage supplied to the computer represents a Rich-Lean signal. For the upstream sensor to be operational very rapidly, it is heated. The heating works only when the engine is running. It is deactivated at a speed above 84 mph (140 km/h) or when the engine is under load.
The downstream sensor is also heated. The command does not activate immediately after starting the engine. It is activated when the engine is running and has reached its operating temperature. The downstream sensor heating is inhibited above 84 mph (140 km/h) or when the engine is under load.”

PS: please fix the hole in the exhaust pipe and then we will see.

This post has been edited by Gil26: 3 Dec 2022, 08:07

I don't have access to such software, I only can use Torque now.

I have logged today voltages for both O2 sensors.

Upstream is 1x1, downstream 1x2.

"Check engine" turned on again.

Torque reported P0141 fault - Heating circuit Bank 1 Sensor 2.



This post has been edited by moxb: 3 Dec 2022, 15:06

Attached thumbnail(s)
Screenshot_20221203_123941.png ( Size: 304.29k ) Number of downloads: 22

I'm trying to make time and send you a PM (I know you still can't send, you don't have the required number of posts =25, but we can discuss here on the forum) two better diagnostic programs for your car and some instructions, I hope the interface is OK, many clones Chinese ELM327 are OK with Torque but not necessarily with these dedicated programs, their use depends on you and is done at your own risk with the assumption of responsibility, but for reading and deleting errors plus monitoring parameters they are OK.

I repeat: please fix that hole (by the way, how big is it?) and then we'll see.
However, taking into account the position of the downstream lambda sensor, it is quite likely that you also have a connection problem. I am attaching in advance some screenshots that can help you, or other forum colleagues, as it is a fairly common problem (by the way, in Romania there are many taxi cars that have the "Check engine" light on because of this sensor but they don't care ).
See the error DF083 (P0141 from Torque), the wiring diagram, the connectors and the checks for a K7M710 engine, in the screenshots I have highlighted everything that is necessary. You can check the sensor connector, the power supply between pin 4-3FB of the sensor and pin A5 of the injection relay white wire, ground on pin 1-3GJ brown wire (even if it might be OK for you), insulation continuity and absence of resistance interference (must be less than 1 ohm) between pins 2-3GL and 44 from injection white wire, 3-3GG and 65 from injection orange wire.

Greetings and good luck!


Attached thumbnail(s)
FaultDF083.png ( Size: 149.71k ) Number of downloads: 23
WiringK7M710.png ( Size: 109.78k ) Number of downloads: 19
ConnectorSensorO2andRelay.png ( Size: 464.03k ) Number of downloads: 17
ConnectorInjectionK7M710.png ( Size: 289.94k ) Number of downloads: 15
Checks.png ( Size: 289.9k ) Number of downloads: 16

Thank you for wiring diagram, I was looking for that, it's a big help.

I will first fix the hole, and then see.

I don't know how big it is, the exhaust pipe holder has broken and some screw has punctured the pipe, so the exhaust is not fixed at the moment, and it's possible that movement of the exhaust pipe while driving has broke the connection of the lambda sensor.
I was driving two days before the check engine light came on again, so I will check again for connection and see if that's the issue or not.
Mechanic used some software on the computer to check connection when replacing sensor and he told me that the sensor was working but the values were not good, so maybe sensor broke connection again while driving with the exhaust pipe moving.

This post has been edited by moxb: 4 Dec 2022, 12:39

As I anticipated, it is very likely that you also have a problem with the connection of the sensor, if for two days you drove without error but the exhaust pipe and the exhaust moves,
(is not fixed at the moment) check the connector and the electrical connections of the sensor, you have the information in post #17. The hole is probably quite large if the support broke and the screw has punctured the pipe, fix the hole and pipe\exhaust system, check the connector and wiring, then we'll see.

I sent you a PM with the program, please check your Inbox, is tested and might be OK for your car, download, install, you have some instructions for use, but this also depends on you, you can also write a feed-back here.
Work on CAN as pleasant, useful and above all without problems.
All the best!

This post has been edited by Gil26: 5 Dec 2022, 06:50

UPDATE:

Exhaust manifold had two cracks and had to be replaced.
"Check engine" is still on and I will have to go to service check for electric problems since diagnostics shows DF083 error.

Thank you for the diagnostics software, very nice of you.
I have tried Pyren following your instructions, and it showed DF083 error.
My guess is that there's probably a wiring issue, but will see after the service check.

Thank you for feed-back, good to know.
Yes, for the error DF083 = Downstream oxygen sensor heating circuit, the OBD warning light can come on and the electrical checks must be done, including the sensor, see the first screenshot from post #17 with the diagnostic of this error, I highlighted it out for you, you also have the wiring diagram, connectors and what is needed.
First replace the exhaust manifold and then we'll see, now you also have a pretty OK diagnostic program (but be careful when using it) and after the problem is solved you can erase the error DF083.

This post has been edited by Gil26: 14 Dec 2022, 18:41

Exhaust manifold is replaced, error was erased but showed up again, so the only thing to check is wiring which I will do in the upcoming days.

This post has been edited by moxb: 14 Dec 2022, 21:18

I've been today at local service and they told me that universal Bosch lambda sensor that I have installed is not good and they offered me to install original sensor.
I refused because it's a high cost.
I bought sensor with exact OEM number as Gil26 told me, so I am not sure if service is right or not.

I have written several times (please read the posts carefully) that the OE code must be checked based on the VIN number and unfortunately you did not provide it so that we can check it for you.

UPDATE:

No, the OEM is ok.
It seems that lambda sensor was wrongly connected.
Wires were wrongly connected to the old jack and sensor fried.
So, I have to buy new one.

Today I have replaced BOSCH sensor that I have previously installed with a NGK 1952 universal lambda sensor, and now "Check engine" light is off, and diagnostics shows everything is fine.

It seems that sensor OEM number for my car is 77 00 103 504
because NGK 1952 is only compatible with that number.

Although BOSCH is also compatible with 77 00 103 504, it does not work.

Thank you.

Another twist to this issue

Today "Check engine" light is again ON!

Been to the service, it seems that electrical installation, probably wires are faulty.
So, the sensor is not the issue.

Service is scheduled for friday, I will post the results.

Service is done, and they replaced sensor again!

Newly installed sensor NGK 1952 was faulty (manufacturer fault), and they installed new one.

Now after driving and measuring sensors with Torque, "Check engine" doesn't turn on anymore, and diagnostics confirmed that both sensors work ok.

In my previous post #16 I have attached Torque screenshot that shows downstream sensor graph looks flat, meaning it wasn't working.

This is the screenshot now when both sensors are working, and it can be seen that downstream sensor displays fluctuations which is fine and working ok.



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Good to know, thanks for the feedback, your experience might be useful to other colleagues.
I'm glad you solved your problem and everything is OK now.
Best regards.