Bigglezworth
October 1st, 2008, 00:46
I'm now almost a full month into new ownership of an RS6 and I can honestly say I have mixed reviews about the performance. Once day the car is fantastic. The next it's blah. Temperature has remained relatively the same (20 deg C) so it's not a situation where the car is experiencing massive heat soak. My CEL came on the first week into ownership and pimped out PO491 and PO492 errors. Did a quick search on the net and came across a post where it was the air system that likely had a broken vacuum hose. This was the case for me and aside from the PITA effort to get the air cleaner assembly off repaired the line, cleared the code and all was well.
One week to the day later and yet again another CEL. This time it's the same two PO491 and PO492 codes, but also a PO441 and PO741 code also. Gas cap is just fine so it's something else to do with the EEC system. The PO741 is troubling. Not sure where this comes into the picture. I cleared the codes and nothing has come back for the past 48 hours. I'm not what I would call an expert with automotive electronics especially when it's an ECU in discussion, but wouldn't you expect to see the code reappear almost immediately if in fact the part was faulty? I wouldn't expect the ECU to somehow intentionally retard the performance if it's not throwing a specific code.
Further to what I see as on again off again performance characteristics I notice that the kick-down doesn't always respond in the same fashion depending on the time of day. At one moment the kick down is exhilerating and puts you back in the seat when the RPM quickly revs to 4500 and up. Other times you can't get the lower gear and instead of picking up in first or second are using third which feels like the engine is bogging out.
Anyway, I can fully appreciate this is a technically complex motor and comes with a host of things that can and will go wrong. Just a little frustrated that things aren't consistent to enable a more ready diagnosis.
Tim
One week to the day later and yet again another CEL. This time it's the same two PO491 and PO492 codes, but also a PO441 and PO741 code also. Gas cap is just fine so it's something else to do with the EEC system. The PO741 is troubling. Not sure where this comes into the picture. I cleared the codes and nothing has come back for the past 48 hours. I'm not what I would call an expert with automotive electronics especially when it's an ECU in discussion, but wouldn't you expect to see the code reappear almost immediately if in fact the part was faulty? I wouldn't expect the ECU to somehow intentionally retard the performance if it's not throwing a specific code.
Further to what I see as on again off again performance characteristics I notice that the kick-down doesn't always respond in the same fashion depending on the time of day. At one moment the kick down is exhilerating and puts you back in the seat when the RPM quickly revs to 4500 and up. Other times you can't get the lower gear and instead of picking up in first or second are using third which feels like the engine is bogging out.
Anyway, I can fully appreciate this is a technically complex motor and comes with a host of things that can and will go wrong. Just a little frustrated that things aren't consistent to enable a more ready diagnosis.
Tim