My wife and I just purchased a 2004 Disco with 38.5K miles on it, looks brand new.
We live in Park City Utah and when we picked up the car in Salt Lake city and drive it home last night all was fine, no SES light on. The drive from SLC to PC is mostly uphill.

So this morning my wife drove the car down to SLC, a decrease in elevation from around 7000 to 5000 feet.

The SES light came on while driving down the hill.
When my wife got home I plugged in my cheapo INNOVA Scan tool and it showed the P1412 code.


After reading all the posts about this I can't seem to find much consensus on what to check. I have read about people replacing SAI sensors, pump, vacuum lines etc. and not fixing the issue, or Even something as simple as replacing the gas cap. I also read on another forum someone bypassed the vacuum reservoir and that fixed the issue.


So I am just curious if there is any new information on what to have my mechanic check before replacing the SAI components.


Thanks
Steven

 

P1412- Secondary Air Injection System – Malfunction Bank 1 LH (Insufficient SAI flow
during passive test)

You have a problem with the SAI on the drivers side. I would check all of the vacuum lines going to and from the drivers side SAI valve. Make sure that the hose clamp is tight and the vac line is on tight. You can also remove this valve by taking off the 2 bolts and clean it out with parts cleaner. You probably have a dirty or blocked valve. It looks like this:

Then check all the vacuum tubes going to and from the vacuum solenoid. It is above the drivers side valve cover and looks like this:


Check the SAI pipe the valve sits on for cracks. It looks like this:


If I had to guess you either have a 1)vac leak, 2)bad solenoid or 3)a dirty SAI valve.

Here are the diagnoses steps:

Flow Fault Finding chart
1 Fault codes P1412, P1414, P1415 or P1417 present
2 Insufficient flow detected
3 Is fault present on both cylinder banks?
If 'NO' proceed to step 4
If 'YES' proceed to step 8
4 Vacuum supply – Check for: blockage and/or vacuum line disconnected from SAI valve
5 SAI Valve – Check for: jam / diaphragm leak or blockage
6 Delivery Hoses to SAI Valve – Check for: blockage / leaks
7 SAI Pipes to Cylinder Head – Check for: blockage / leaks
8 Electrical Issue – Check for: Related P code (relay/fuse/solenoid), rectify as necessary and check connectors
9 Vacuum Supply – Check for: Blocked/leaking vacuum lines or correct solenoid operation (open/closed)
10 Delivery Hoses – Check for: Blocked/leaking hoses
11 SAI Pump – Check for: Correct operation using TestBook/T4 or pump blockage/failure
12 SAI Valves – Check for: Both SAI Valves jammed/blocked/leaking diaphragms

 

Jarred,
Wow thanks for the tips I will for sure have my mechanic do what you suggest.
Thanks again
Steven

 

I'd be equally as worried about Vail resorts trying to take over PCMR. But that's just an unrelated opinion from a small ski town living colorado ski bum. Fight Vail to the death!!!!!

Good luck with O2's... glad my PO took care of mine just prior to my purchase.

 

powderhound,
Yep huge battle going on right now with Vail and PCMR, I am actually a wimp and ski at Deer Valley with all retired folks :-)


I hope I get my wife's Disco all fixed up..

 

Interesting. Mine did the same thing when I was up in the mountains from 2400-ft to 5500ft. I cleared the code and after getting back to 2400ft it has not returned. I bought the Vacuum solenoid just in case but have not installed yet.

David