Secondary Air Injection System +?

2010 Tundra 4.6 200k miles

Symptom: engines struggles when driving up slight incline (4k rpm at 45 mph); feels normal on flat road; but CEL light on (plus VSC and flashing 4Lo … sometimes)

Codes: I pulled p0419, p2447, p0021, p2714 (with $40 reader)
Brake/Suspension shop pulled p0419, p2447 only (with mx808 reader)

Does this sound like Hewitt-Tech time?

Thanks!

 

After installing an HT Gen2: Secondary Air Injection System Bypass Kit, performance is fine.

Codes today: p0021, p0018 (new), p2714.

Any ideas where to start? Thanks.

 

I literally have same truck! 2010 4.6 (137k odo)

I had my lump replaced by toyota because recall.

 

I just checked no recalls on the truck.

 

Here's the paper. Unfortunately you might be out of date and/or miles at this point..