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Hi

I bought a 309 1.6 Hdi a couple of days ago
It runs and drives fine, no sign of problems, no warnlng lights, no check engine light and so on, so far so good,
I did a scan with my ELM 327 and it found 2 faults, P2408 and P1351.
I tried to clear them but it does not work.

I looked it up and found out what they meant.
P1351: glow plugs / glow plug relay
P2408: Fuel cap sensor. I measured the resistance and it was only 34 ohms with the cap on, and did not change with the cap off. So I guess that I should replace the sensor.

But how does theese faults affect the regen of the DPF?
Will it still regen "naturally" when I´m driving?
For instance I have 31 miles to work and nearly all the way the speed limit is 55mph. Will the DPF clean itself with that kind of driving?

Sholdn´t I get a check engine light with theese fault codes?
 

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Check that the fuel cap still has the magnet inside it before replacing the loom. Also, check the plug on the loom where it connects to the main loom for corrosion/water.

P1351 is a common 'ghost' fault on a LOT of diesel peugeots. It comes up on some cars even though there is nothing wrong with the glowplug system.

HOWEVER, before dismissing it, do a resistance check on each glowplug, each should have a resistance value of around 1 ohm. If any show high resistance or open circuit, replace them, it might just switch the code off [it did in one of my 406hdi's, the rest all have P1351 even though the system functions correctly.. :confused:]

Glowplugs are used in regeneration, faulty ones will not help with the regeneration process, or even prevent it occurring, so make sure they are all working. I have only once found a faulty glowplug relay. The relay can be easily tested in any case.

Your 31 mile trip at 55mph will easily do a full regen.
 

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Check that the fuel cap still has the magnet inside it before replacing the loom. Also, check the plug on the loom where it connects to the main loom for corrosion/water.

P1351 is a common 'ghost' fault on a LOT of diesel peugeots. It comes up on some cars even though there is nothing wrong with the glowplug system.

HOWEVER, before dismissing it, do a resistance check on each glowplug, each should have a resistance value of around 1 ohm. If any show high resistance or open circuit, replace them, it might just switch the code off [it did in one of my 406hdi's, the rest all have P1351 even though the system functions correctly.. :confused:]

Glowplugs are used in regeneration, faulty ones will not help with the regeneration process, or even prevent it occurring, so make sure they are all working. I have only once found a faulty glowplug relay. The relay can be easily tested in any case.

Your 31 mile trip at 55mph will easily do a full regen.
Thanks for quick response!:thumb:

The magnets are still there, that was the first that came to mind.
I measured the sensor (well, I think it was the sensor?) Under the back seat above the tank with one gray and one blue wire? 34 ohms with cap on/off.
I´m going to take a look at the relay and the plugs, as you say, this weekend and try to sort it out...I hope it´s the relay, the glow plugs looks difficult to reach.
 

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Cap sensor resistance should change when cap is on or off if not sensor is not working relay will be fine it will be a bad plug plugs or no fault as above you can test plugs at relay plug 1 wire goes to each plug or pairs depends on age

Although a long run will regen if the system is not working correctly then it will not regen readily.
 
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