C5 Hdi 110 Fault Codes

[johntom]

Hi

I recently blanked off the EGR valve on my 2004 hdi with a plate bought via ebay. The car ran well however after the maiden voyage of 20 miles the anti pollution message and engine management light came on. My code reader came up with the following codes:

po341 Camshaft position sensor A bank 1 - CKT range performance,

po402 EGR flow excessive,

po400 EGR flow malfunction.

I cleared the codes which lasted for a few miles before returning, however only codes po341 and po402.

 

Would blanking the EGR cause this and should I have removed and sealed the vacuum hose to the valve (i just left it attached as it was)?

Would the fault codes po341 and po402 be connected or is it just coincidence?

 

how do i test/rectify?

any help greatly appreciated.

[coastline taxis]

why did you blank the egr valve off ?.

[johntom]

Hi

I blanked it off as I heard that it would improve low end pick up - which it did. The car had been juddering/shaking when started from cold, after fitting the egr blanking plate this stopped. Unfortunately within one journey of fitting it the engine management light came on. I read the codes p400, po402 and po341, they cleared but came back on again very soon. I removed the blanking plate the other day, reset the codes and they stayed off (except po342 camshaft position sensor) - however the shuddering at tickover has returned, so it's definitely connected to the egr. Someone has said that the egr is controlled via the MAF so that may be faulty ?