I have a 2001 Audi A4 Quattro 1.8T AWM 5 speed manual...
So here's the story, CEL came on for P1296 a week ago. I completely flushed the coolant from the block, head, all hoses and heater core as well, only because it was time to flush the coolant and I wanted to use the G12++ which was not in the car previously. I also installed a new Bosch MAF, Meyle -brand thermostat/o-ring and the 4 pin coolant temp sensor in the bottom hose of the rad. Ordered all my parts from ECS Tuning. Cleared the code after the repair and 3 days later, poof! CEL again for P1296. Harness looks good, car has not been in any accidents, temp gauge comes right up to temp and stays in the middle like its supposed to. Before these changes temp gauge was all over the place. Fans operate as should with a/c on on or off.. I'm at a loss, please help...
The only thing I can figure is the thermostat or the coolant concentration at this point. I kinda spilled some of the coolant on the floor and had to mix a bit more deionized water than G12, so the coolant is probably 60%-70% water, could that cause my P1296? And I say t-stat because no matter after how long I drive the lower hose is never just as hot as the top hose, they get close to being the same but never the same temp, the lower hose is always cooler to touch.
Let me know what you think...
Pics, low temp is my lower rad hose. Hi temp is my top rad hose all after 15 mins of spirited interstate driving and 5 mins of idle time. Engine is still running in these pics.
I had the previous post with the p1296 code. It turned out to be the coolant sensor at the rear left(passenger side) bank of the v6. Once I replaced it the and cleared the codes all was good.
Be careful when removing the nylon plastic c clip that holds the sensor in place. You will need to remove the air cleaner duct along with the vacum (hard plastic hoses) at the intake of the throttle body. Be super careful with these hoses because with heat they get brittle.
The sensor is around $60/$70.00. If it is not the sensor then it will probably be the thermostat and that will be a major job because you will need to remove the timing belt and cam gears to get to the thermostat. Which means you need the cam removal tool. AUDI tool. Which means you'll have to get it to an AUDI shop because they will be the only ones that have that bar. A real pain.
Try the sensor and go from there.
With any luck that should do it. mhg audinmusa