Peugeot 207 fault code P1490, P242F

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RichardW
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Re: Peugeot 207 fault code P1490, P242F

Post by RichardW »

I would think so, but you've got the meter on 200 ohms only, did you try any of the larger scales? It might be more than that, but since it's giving a duff reading, I'd be inclined to think it was dead!
207Peugeot14
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Re: Peugeot 207 fault code P1490, P242F

Post by 207Peugeot14 »

RichardW wrote:
14 Dec 2021, 14:01
I would think so, but you've got the meter on 200 ohms only, did you try any of the larger scales? It might be more than that, but since it's giving a duff reading, I'd be inclined to think it was dead!
Apologies Richard

What should i have it set on please

Many thanks
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Re: Peugeot 207 fault code P1490, P242F

Post by RichardW »

Just go through the various resistance settings and see if you get a reading on any of them.
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myglaren
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Re: Peugeot 207 fault code P1490, P242F

Post by myglaren »

This might help:
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GiveMeABreak
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Re: Peugeot 207 fault code P1490, P242F

Post by GiveMeABreak »

Ok this may help, so the exhaust gas temp sensor is '4' below. The resistance is measured in KiloOhms (1000 Ohms = 1Kohm). So the resistance you are getting '1' would be about right for a temperature of 149 °C if you look at the graph below. The higher the resistance, the colder the gases are. There's not much room after about the 150 °C temp, as the line bottoms out. So the only way to tell of the temp sensor is faulty is allowing the car to completely cool down (say overnight and be ready to test it with everything connected) so that you can re-check the reading. If it's the same as before, then you may well have a faulty sensor.

You would need to let the car completely cool down, get it set up ready and then test it when the engine is cold to see of the Resistance goes up as shown in the table depending on exhaust gas temperature.
DV4C Temp Semsor.PNG
(4) Particle filter upstream temperature sensor.
"a" Pressure take-off upstream of the particle filter.
"b" Pressure take-off downstream of the particle filter.
dv4c Exhaust sensor graph.PNG
"R" Resistance R (In Kohms ).
"T" Coolant temperature (°C).


The NTC (Negative Temperature Coefficient) resistance value "R" changes in relation to the change in the temperature "T":
When the temperature "T" increases, the resistance value "R" decreases
When the temperature "T" decreases, the resistance value "R" increases


Minimum value (°C)Temperature (°C)Maximum value (°C)Resistance R (In Kohms )
-50-40-30133,8
-20-10046,76
-1001034,49
10203019,86
4050609,748
901001103,770
1401501601,802
1902002101,001
2402502600,616
2903003100,412
3403503600,293
3904004100,218
4404504600,168
4905005100,134
5405505600,109
5906006100,090
6406506600,076
6907007100,065
7407507600,056
7908008100,049
8408508600,043
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Re: Peugeot 207 fault code P1490, P242F

Post by RichardW »

Useful info Marc, the meter needs to be set to 200k setting to get a sensible reading.
207Peugeot14
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Re: Peugeot 207 fault code P1490, P242F

Post by 207Peugeot14 »

RichardW wrote:
14 Dec 2021, 22:33
Just go through the various resistance settings and see if you get a reading on any of them.
Ok slow reply again apologies

Few pictures to show my findings, no other readings on other settings.

Also found this tread online so looks like someone else has the same issue.

https://citroenc3owners.com/questions-a ... t4590.html

I've a 200 mile round trip tomorrow so will see what happens, but i scanned the car straight after fitting a new sensor and the scan showed the temperature of the sensor was 149°C ...

Thanks again all
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207Peugeot14
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Re: Peugeot 207 fault code P1490, P242F

Post by 207Peugeot14 »

Apologies I've just put a post up and then realised others have already posted (not getting email notifications for some reason)

That's all very interesting information thanks for that info,

That's what i love about car forums it's the knowledge of others it's just great.

Thanks again all
207Peugeot14
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Re: Peugeot 207 fault code P1490, P242F

Post by 207Peugeot14 »

Morning all

Well i done a global scan this morning before my journey and no fault codes was showing.

So i then proceeded to drive 80 to 90 miles doing a live scan, shortly after starting my journey the orange triangle with the explanation mark by the milage came on and the centre consol displayed the message "RISK OF PARTICULAR FILTER CLOGGING"

car carried on driving fine and then stopped to upload data here, exhaust temperature sensor still showing 149°C



After this video i done a global scan and car now showing fault code P1490 see video showing the information.



I really do not understand what is causing the issue.

Many thanks
207Peugeot14
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Re: Peugeot 207 fault code P1490, P242F

Post by 207Peugeot14 »

GiveMeABreak or RichardW sorry to be a pain have you any advice on my previous posts please

Many thanks