P1299 on 2002 Mercury Mountaineer V8 4.6L

Question

My check engine light is on code said p1299. Before the check engine light turned on the check gage light would turn on and off every 30minutes lasted about 2 days like this then out of nowhere the check engine turn on and the check gage light was on also and even tho I would accelerate fast the rpm would go to 3 and speed to 10mph it wouldn't go any higher stayed like that for about 2 minutes and it was all shaky also just because I wanted to get home asap the truck didn't turn off but when I got home water was leaking on the bottom don't know exactly where but it was somewhere on the passenger center side. In the last 2 months its been nothing but waisting money I've changed the oil, changed the ac compressor because it was leaking antifreeze also changed the hoses connected to the ac compressor, changed the spark plugs because check engine light said so, and the radiator is about 2 years new

Answer 1

Hi there,

This code indicates an issue with the cylinder head temp sensor. Here is some info for you.

P1299 MERCURY - Cylinder Head Temperature Sensor Detected Engine Overheating Condition

Read more: https://www.autocodes.com/p1299_mercury.html