po1299 2003 f150 4.2
#1
03-09-2017, 12:53 PM
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po1299 2003 f150 4.2
i have been having head temperature sensor problems with my truck 7 months ago it went bad giving me false temp readings i took it to local shop replace it and for seven months np then it started doing it again took back to shop because of warranty they said the temp sensor was good and they could not find a problem with the connecting cable . any ideas
#2
03-09-2017, 01:38 PM
There are a number ways to check the system.
Use a Scanner to look at the temperature reading to see what it tells.
Look at the dash diagnostic to see what the dash sees from the head temp sensor. Step to the " dEGC reading and look at the number. It is in degree C.
49 = cold gauge reading, 49 = beginning of normal range, 60= end of normal range. What do you see.
Then what does the dash gauge say?
One or all these will show something and a logic of what the issue likely is.
It's not good enough to just say nothing is wrong by a shop.
The 1299 code puts the engine control system in Limp mode.
It does not run very well in that mode ..by intent of design for engine protection.
Next is the engine actually over heating from a loss of coolant or air in the system?
Is the thermostat stuck closed for is faulty?
Some one has to get with the show.
Good luck.
..
Use a Scanner to look at the temperature reading to see what it tells.
Look at the dash diagnostic to see what the dash sees from the head temp sensor. Step to the " dEGC reading and look at the number. It is in degree C.
49 = cold gauge reading, 49 = beginning of normal range, 60= end of normal range. What do you see.
Then what does the dash gauge say?
One or all these will show something and a logic of what the issue likely is.
It's not good enough to just say nothing is wrong by a shop.
The 1299 code puts the engine control system in Limp mode.
It does not run very well in that mode ..by intent of design for engine protection.
Next is the engine actually over heating from a loss of coolant or air in the system?
Is the thermostat stuck closed for is faulty?
Some one has to get with the show.
Good luck.
..
#3
03-09-2017, 07:56 PM
Join Date: Mar 2017
Posts: 4
Likes: 0
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i have been having head temperature sensor problems with my truck 7 months ago it went bad giving me false temp readings i took it to local shop replace it and for seven months np then it started doing it again took back to shop because of warranty they said the temp sensor was good and they could not find a problem with the connecting cable . any ideas
There are a number ways to check the system.
Use a Scanner to look at the temperature reading to see what it tells.
Look at the dash diagnostic to see what the dash sees from the head temp sensor. Step to the " dEGC reading and look at the number. It is in degree C.
49 = cold gauge reading, 49 = beginning of normal range, 60= end of normal range. What do you see.
Then what does the dash gauge say?
One or all these will show something and a logic of what the issue likely is.
It's not good enough to just say nothing is wrong by a shop.
The 1299 code puts the engine control system in Limp mode.
It does not run very well in that mode ..by intent of design for engine protection.
Next is the engine actually over heating from a loss of coolant or air in the system?
Is the thermostat stuck closed for is faulty?
Some one has to get with the show.
Good luck.
..
Use a Scanner to look at the temperature reading to see what it tells.
Look at the dash diagnostic to see what the dash sees from the head temp sensor. Step to the " dEGC reading and look at the number. It is in degree C.
49 = cold gauge reading, 49 = beginning of normal range, 60= end of normal range. What do you see.
Then what does the dash gauge say?
One or all these will show something and a logic of what the issue likely is.
It's not good enough to just say nothing is wrong by a shop.
The 1299 code puts the engine control system in Limp mode.
It does not run very well in that mode ..by intent of design for engine protection.
Next is the engine actually over heating from a loss of coolant or air in the system?
Is the thermostat stuck closed for is faulty?
Some one has to get with the show.
Good luck.
..
ITS not overheating the guage will spike oil light comes on truck does not shut down normally .it just threw the po1299 go when i got it out of the shop the degc reads 122 at its highest the mec told me the scanner did not show the engine above 150 and he thought i may have a short in the harness
#4
03-09-2017, 09:44 PM
I just explained all the elements above.
Why is the harness not being investigated?
The dEGC at 122 is signaling a fault. That reading is in degree Celsius and equals 251.6 F. This will generate the 1299 code.
You have the answer right in that data number.
The cooling system does not normally run over about 195 F +/-.
Good luck.
Why is the harness not being investigated?
The dEGC at 122 is signaling a fault. That reading is in degree Celsius and equals 251.6 F. This will generate the 1299 code.
You have the answer right in that data number.
The cooling system does not normally run over about 195 F +/-.
Good luck.
Last edited by Bluegrass; 03-09-2017 at 09:53 PM.