Join Date: Apr 2008
Location: Beeville, TX
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the 1211 code means you've had all the fun you can have. Basically you are running low on high pressure oil, which drives your injectors. Normally the p1211 code means that you were hammering it too hard, and you were demanding more high pressure oil than the truck can provide. It doesn't usually cause a noticeable problem though (aside from the actual light). My brother gets it all the time on his '03 with a TW chip. But it doesn't seem to cause a performance loss. If you are actually experiencing a performance loss, then I would be worried about the high pressure oil pump starting to flake out on you.
BTW, the sensor that was replaced is called the ICP (Injection Control Pressure) sensor, and if it had oil in the electrical connection, then it was bad, and time for a new one anyway.
Eli Benson - EMT, Ambulance Mechanic
'08 F350 Dually KR - Spartan'd
'07 F250 CC SB 4x4 XLT - SCT /w Innovative Tunes
4 '09 & '10 E350 6.0l ambulances
1 '08 Duramax 6.6 (LMM) van ambulance