CEL P0418
11-30-2018, 12:52 PM
#1
CEL P0418
I have C4S 2003 3.6L. I tried searching and best luck I had so far was that the issue involves the SAI, but beyond that not much.
Prior to this I was having CEL Catalyst failure which has been cleared and resolved. I’m not sure if the SAI motor burned itself out trying to pump more air in to compensate?
any help would be greatly appreciated.
Prior to this I was having CEL Catalyst failure which has been cleared and resolved. I’m not sure if the SAI motor burned itself out trying to pump more air in to compensate?
any help would be greatly appreciated.
11-30-2018, 01:03 PM
#2
RL Community Team
Rennlist Member
Rennlist Member
Can you confirm that the SAI is working on startup?
Disconnect the hose and you'll hear it running.
Disconnect the hose and you'll hear it running.
11-30-2018, 01:27 PM
#3
4th Gear
Join Date: Nov 2018
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Indeed, you can hear it running. If in doubt, on a cold start you can put your hand on it and feel it running. This is the first place to start. You can replace the SAI pump quite easily without taking anything else apart.
I had a CEL for SAI system. I ended up replacing both of the valves, the first one that's inline and the second valve that screws into the exhaust manifold. They were both pretty plugged up with carbon deposits. You can get both valves, genuine Porsche OEM for around $250. Once you remove the alternator, you can access everything quite easily.
Replaced both valves and check engine light came back on. Ended up tracing every vacuum line from the SAI diagram and found the culprit at the back side of the vacuum tank (sits directly behind the alternator). I've still never actually seen it attached. I took out the vacuum tank and checked out the attachment point and made sure it wasn't broken. Put the tank back and plugged the vacuum line back up by feel. I also ended up putting a zip tie around the vacuum line manifold and the vacuum tank to hold everything in place.
I had a CEL for SAI system. I ended up replacing both of the valves, the first one that's inline and the second valve that screws into the exhaust manifold. They were both pretty plugged up with carbon deposits. You can get both valves, genuine Porsche OEM for around $250. Once you remove the alternator, you can access everything quite easily.
Replaced both valves and check engine light came back on. Ended up tracing every vacuum line from the SAI diagram and found the culprit at the back side of the vacuum tank (sits directly behind the alternator). I've still never actually seen it attached. I took out the vacuum tank and checked out the attachment point and made sure it wasn't broken. Put the tank back and plugged the vacuum line back up by feel. I also ended up putting a zip tie around the vacuum line manifold and the vacuum tank to hold everything in place.
12-02-2018, 05:16 AM
#4
Drifting
Join Date: Sep 2011
Location: Ephrata, PA, USA now. Originally from the UK
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if you are removing you alternator, then read up on the correct procedure and be very careful when messing around by the vacuum tubes. They crack quite easily and then you have all kinds of trouble on your hands. Good luck.
12-02-2018, 10:37 AM
#5
Rennlist Member
Good time to replace all the brittle spaghetti hoses.
12-24-2018, 11:37 AM
#7
Rennlist Member
Any update Red? I just got the CEL myself.
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12-24-2018, 01:54 PM
#8
Rennlist Member
I have C4S 2003 3.6L. I tried searching and best luck I had so far was that the issue involves the SAI, but beyond that not much.
Prior to this I was having CEL Catalyst failure which has been cleared and resolved. I’m not sure if the SAI motor burned itself out trying to pump more air in to compensate?
any help would be greatly appreciated.
Prior to this I was having CEL Catalyst failure which has been cleared and resolved. I’m not sure if the SAI motor burned itself out trying to pump more air in to compensate?
any help would be greatly appreciated.
08-02-2019, 10:30 AM
#11
Rennlist Member
Thank you for updating and ending the mystery.