Fault code reader live data reading oxgen sensor not ready ,but engine is up to temp,would this be the oxgen sensor ,at fault ie no good

Generic code reader will only read codes of faults that will or could affect exhaust emissions though many inexpensive code readers will usefully also allow the viewing of live data.
Sometimes knowing what a fault isn't is quite useful...

I heard from a colleague that Jeep electronics aren't easy to read and dealer level diagnostic equipment is sometimes necessary.

If you don't have a code reader that reads live data, borrow one or go to an auto parts house and 'rent' one. Watch your intake air temp (and coolant temp) as the engine warms up. If you don't see the temperatures going up (coolant more than IAT), you may have a bad temp sensor. The computer feeds more fuel when the engine is cold, and may be running the engine excessively rich when it is warmed up.

you need to get the fault codes out of the engine control module and the transmission control module ie ecm and tcm with a eobd fault code reader to help sort this one . common probs are faulty jatco auto gearbox (rubbissh gearbox) poss engine managment sensor failures or even a broken/corroded wire or connector, good luck,.

if its a diesel engine then their is a relay/timer box but this is a petrol so iam at a loss as to weither this is a code reader fault reading the fault as i have two code readers and cannot get into a ford of this age it will only read the vin number so iam at a loss as to either a cab heater fault which i cannot see throwing the engine light on or the autochoke sensor because all these code readers give the answer in good old american and we all know they cannot spell colour correctly or pronounce aluminium.Bless them no go for the engine autochoke sensor and check that out first but the main cause of the light on with a ford of this year is the O2 sensor their are two wires the same colour out of the four wires now disconnect the socket and check for a continuety on the sensor side of the socket and if no continuety then renew the sensor if a check shows continuety the check the opposing plug socket and check for a 12v supply .Hope this helps and sorry i cannot pronounce aluminium or know the difference between a saturn or a windstar and think all nissans are diesel ,red face on my part here but iam a brit living in spain .

Po116 is a code for coolant temp sensor out of range. I would check the temp sensor data with a scan tool to see what it is reading. If it is lower/higher than it should be than there are a couple of possibilities.

1. the coolant temp sensor is bad (or possibly the wiring to and from it)
2. there may be an issue with the thermostat.

Reading live data with a scan tool would be a good start. The temp sensors are not that terribly expensive and fairly simple to replace. It wouldn't be a bad idea to start with replacing it if you don't have access to live data on a scan tool.

let me know what you find or if you have any questions. Thank you for using fixya.com!

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Using your tatco code reader, select current data (real-time data) and select engine coolant temp sensor (ECT). Run engine to operating temperature (A/C off). Monitor the temp reading - when the temp reaches approx 204 deg farenheit, the fans should kick on, after the temp drops to approx 198 deg farenheit, the fans should turn off. The fans are controled by the ECM (Engine Control Module). The ECM controls the cooling fan relays.

Just because the fault codes read out the O2 sensor, it does not mean the sensor is bad. You can have a lean or rich condition that is caused by some other engine part that has gone bad. A diagnosis has to be done by a technician using a high end scan tool to monitor various data in the computer.

You MUST read the fault codes to discover what cylinder is misfiring. Why not buy a cheap fault code reader. Here is one such reader. New OBD2 II EOBD Car Diagnostic Code Reader Live Data

all eobd codes starting with p zero have standard meanings irespective of model or make
PO12 CODE CAMSHAFT POSITION (cmp) intake/front,bank 1 timing over ******
possible cause valve timing engine macanical fault cmp acutator
POO36 CODE HEATED OXGEN SENSOR HO2S)2BANK 1, HEATER
CAUSE FAULTY SENSOR WIREING SHORTING TO EARTH EC
PO59 HEATED OXGEN SENSOR (HO2S) BANK 2, HEATER RESISTANCE
WIREING HO2S
THESE FAULT CODES HAVE BEEN OBTAINED FROM AN AUTO DATA DISC
I HOPE THIS IS OF SOME HELP TRY CLEARING THE CODES AND SEE IF THEY RE APEAR
IF THEY DO THE SENSORS AND WIRING NEED CHECKING