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Discussion Starter #1
Hello all

I have a 2003 307 2.0 HDI FAP, RHS engine. I ve just got back from a longish motorway trip where the engine management light came on twice. After stopping and a few restarts the light went off again both times. No messages on the display and car is not in limp mode. I've read the fault codes and they are as follows:

P0402 --- EGR valve; positive deviation
P0246 --- Turbo pressure; pressure measured too low
P1421 --- Catalytic converter 1; upstream temperature signal, short circuit to earth
P1425 --- Catalytic converter 1; downstream temperature signal, coherence between converter 1 and 2 temperature
P1132 --- Fault on catalytic converter upstream and downstream temperature sensors

the first three I have had in the past with no engine light coming on. The last two I ve not had before. Car has done approx 175k miles. FAP/DPF regenerations are happening and the FAP/DPF fluid has recently been topped up by Peugeot. DPF was changed at around 125k miles by Peugeot.

Any suggestions as what the problem might be?

Thanks
 

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Hello

had a further look around today and found a split in the intercooler pipe and a broken vacuum hose connection, which may explain some of the fault codes. I ll replace the intercooler pipe and see if that resolves the issue.
 

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just an update in case it might help others, I replaced the split intercooler pipe (top one), erased fault codes and have driven 1000 miles or so since.
P0402 --- EGR valve; positive deviation
P0246 --- Turbo pressure; pressure measured too low
P1132 --- Fault on catalytic converter upstream and downstream temperature sensors

faults have not come back sofar,

P1421 --- Catalytic converter 1; upstream temperature signal, short circuit to earth
P1425 --- Catalytic converter 1; downstream temperature signal, coherence between converter 1 and 2 temperature

are still coming back. Sofar the engine management light has not come on again, DPF has been regenerating every 300 miles or so. Any suggestions as to what the issue setting code P1421 and P1425 might be?

Thanks
 

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1st cat code is the cause of the 2nd cat code as basically second code is saying the 2 readings are not correct and this is because the first reading is not correct check the wiring before attempting to replace anything
 

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What's with theP0246 --- Turbo pressure; pressure measured too low , have you checked about it with the mechanic, I personally wouldn't play with any turbo codes
 
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