Purchased a 1.6hdi some time ago and have been trying to pinpoint the cause of a p0402 which will not allow the regeneration of the dpf. Changed some parts on it like the turbo oil feel pipe, had the turbo checked and it seems to be spinning freely. Changed the vacuum solenoid thats at the back of the bulk head, and the MAF sensor with a brand new pierburg and the error keeps showing up. I’ve ran some live data screenshots and was hoping direction on the cause based on the screenshots. I’ve been told to remove the dpf which i dont want to do, or to change the turbo.
VF3**************[VIN obfuscated, can be read by forum staff]
Peugeot 307 1.6hdi p0402
Moderator: RichardW
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Re: Peugeot 307 1.6hdi p0402
P0402 seems to be excessive EGR flow. What is the EGR valve position doing vs the reference value? What is the air flow vs the reference value?
Richard W
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Re: Peugeot 307 1.6hdi p0402
Fault Code Info (bit of a lottery on the suspect areas though
):
![Rolling Eyes :roll:](./images/smilies/icon_rolleyes.gif)
Fault Code: | P0402 |
Description of Fault: | Air system fault: Measured quantity of air lower than the setting. Positive gap for 10 seconds between the theoretical air flow and the calculated measured air flow. Conditions of activation of the diagnostics: The following conditions have to be met: - Consult the associated contexts for the Pcode forwarding conditions - Engine speed between 750 and 2750 rpm |
Conditions for Fault to clear: |
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Downgrade Modes whilst Fault is active: |
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Symptoms: |
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Suspect Areas: |
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Please Don't PM Me For Technical Help
Marc
Marc
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Re: Peugeot 307 1.6hdi p0402
Thanks Marc, that's definitely a lottery to try and figure out where it is. The error takes a while to come up, and my filter housing is not in great shape. The pipework for the fresh air, doesn't attach real well, however, the maf and the pipe going to the turbo from the maf is attached pretty good with a new pipe and seal.
I changed out the EGR since i did not have diagbox when this error initially came up, and googling p0402 usually points to EGR fault. Changed it with a new Nissens EGR, the original was a bit dirty, and i think that's due to the car not being able to regenerate for a while.
Originally the car had a P1251 - Pre-heating relay circuit , Relay supplied and plugs never supplied error. The glow plugs hadn't been changed and were the original, so I changed them, and that error went away.
Is the principal air meter an actual sensor ? I was thinking of replacing the Turbo charger pressure sensor but not actually getting a code for that.
I changed out the EGR since i did not have diagbox when this error initially came up, and googling p0402 usually points to EGR fault. Changed it with a new Nissens EGR, the original was a bit dirty, and i think that's due to the car not being able to regenerate for a while.
Originally the car had a P1251 - Pre-heating relay circuit , Relay supplied and plugs never supplied error. The glow plugs hadn't been changed and were the original, so I changed them, and that error went away.
Is the principal air meter an actual sensor ? I was thinking of replacing the Turbo charger pressure sensor but not actually getting a code for that.
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help turbocharger boost control position sensor A circuit ?
is this just a change of sensor doesn’t go into limp mode or a thing ?
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Re: Peugeot 307 1.6hdi p0402
Im starting to think it might be. I ordered a Hella 009400521 boost pressure sensor and just waiting to make my way back overseas in july and see if it resolves the issue. Otherwise I might have to smoke test the pipework or even dismantle it all to see if theres an obstruction. Hoping I wont have to replace/recycle the turbo.