SAIS bypass via tune

Good afternoon everyone, recently I pulled one of the dreaded codes for the secondary air injection emissions system (P2442) on my 2007 Tundra 5.7. I currently have a second vehicle for daily use, therefore I don’t commute in the tundra anymore. For this reason I’d like to bypass the SAIS system as I’ve read they are prone to repeated failure over time and I don’t have money to replace it. I’ve looked at the bypass kit, although I’m reluctant to trust aftermarket parts to keep my truck running properly. I’ve read about tuning via DAP or hptuners, it seems to be the most reliable way to bypass the codes that keep putting it in limp mode. I know next to nothing about tuning and vehicle electronics, is it feasible to block the codes via tuning as someone who isn’t familiar with tuning? I don’t even know what DAP means, assuming it’s a brand? If anybody could provide a walk-through of what I would need to do and if this would work I would really, really appreciate it! I’m almost at 200k and I don’t want emissions issues to keep this truck continuing to sit and gather dust.

 

I'm having the same issue and am installing the bypass kit this weekend. everybody seems to gave good luck with the Hewitt Gen 2, so that's what I got. I'd rather throw a $450 part at it than spend thousands on a mechanic

 

The tune will turn the lights off on the dash, but if someone plugs into and scans the truck they will see the SAIS has failed. The limp mode throttle limits can be bypassed in the tune, at least there's tables for it that I always "turn off", but I've never had someone have the SAIS fail to see if the limp mode is ENTIRELY disabled, so take it with a grain of salt.

If you have to pass emissions and the SAIS will make it fail, then I do not think a tune is able to fix it if the emissions place is thorough. If that is not a concern, then a tune will conceivably be able to fix all drivability and dash light annoyances.


In regards to the tuner, that may be its own cluster and probably not cheaper than the Hewitt kit. DAP was a tuning company/individual that no longer exists. OTT is the big name but I think they refuse to touch anything related to emissions. If there's a local place/individual with HP Tuners or VF Tuner they could quickly go in and turn it off, but it'll cost at least $200 to unlock the ECU to tune it. You could do it yourself, but then you're in $600 between the $400 flashing hardware and the $200 ECU unlock.

 

I had p2442. It wasn't permanent yet so I over rode the system check. I did the DIY AIP bypass where it says it a good temp, installed block off plates and disabled the non electrical codes. I already had hpt so based on what @snivilous stated. You need the Hewitt system to totally bypass it (the drivers and front pumps).

 

this guy SAISes

 

I did the diy version a dozen years ago on my 08. It's been fine and trouble free for almost 200k miles. It was at 50k miles when I did the diy version.

It's pretty simple. If you can solder or crimp wires, you can do the mod for less than $40.

The only issue you may have is you need to know if the truck ever had the modules reflashed.

Toyota changed the programming so the pumps would randomly cycle when the truck was parked.

You need to find out if the truck got the reflash.

You can check be going to Toyotaowners.com, enter your VIN and you will see all the service that was ever perform at any dealership.