Hi,
The vehicle's condition really is what is dependent on the repairs. If it is in good condition, I would say fix it. Prices are through the roof right now on used or new vehicles.
Note: No engine size was indicated, so I went with the 4.0L 6 cylinder. If that is incorrect, let me know.
Code 1281 Engine operating temperature takes too long to be reached -- Likely needs a thermostat.
Code 1391 - Intermittent loss of crankshaft position or camshaft position sensor signal. This may or may not be a sensor issue but rather a wiring issue.
Code 0118 - ECT-related issue (Engine Cooling temperature Sensor) Could be the sensor or wiring.
Interestingly, 1281 may be the result of 0118.
If they have checked these components and verified it is a sensor-related issue, I feel it would be worth the cost. However, I don't know the vehicle's condition.
As far as cost, I attached 4 pics below. Each one provides the part cost (dealer part cost which is extremely high) and labor hours. I'm not sure what the labor rate is where you had it checked, but you would add the labor together and multiply it by the shop's hourly rate.
Again, the part costs indicated or original equipment parts which are much higher than you could get them for at a parts store. If you want to save labor, I can help you through replacing the parts.
Let me know if this helps or if you have other questions.
Take care,
Joe
See pics below.
Images (Click to make bigger)
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Tuesday, March 22nd, 2022 AT 8:51 PM