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what engine, what size. that is first question.
misfire, map ,maf, iat, ect,tps and cat fail and low coolant temps.
very odd mix there. did you pull connections, key on???????
it means they all fail a test.
DIY? or just curious?
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the question is , which is the most important.
all are cept 420, (last that, and bet goes way. later.)
reset the ECU, and see which come back.?
check all fuses.
then post codes that repeat, after fuse checks.
does the engine get fully hot running, 180F minimum?
P0300 is random multiple cylinder misfire and P0316 is misfires detected on start up. This is an ignition related issue. I would check the ignition system and tune up condition and proceed from there also if you have access to a sanner with live data capability check that you have and RPM reading when cranking the engine and the times it deosnt want to start this would indicate an issue with the crank sensor
my engine light also came on one day and I got the same, its common in older cars for this light to stay on all the time, you can truble shoot this by spending money on each of the engine sinsors, but i have had this light on for over 5 years and nothing is wrong with my car
PO 134 = 02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR1)
PO 153 =02 SENSOR CIRCUIT SLOW RESPONSE (BANK 2 SENSOR 1)
PO 154 =02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 2 SENSOR 1)
PO 155= 02 SENSOR HEATER CIRCUIT MALFUNCTION (BANK 2 SENSOR 1)
PO 171= SYSTEM TOO LEAN (BANK 1)
PO 174= SYSTEM TOO LEAN (BANK 2)
I WOULD SAY YOU HAVE FAULTY OXYGEN SENSORS CAUSING THE ENGINE TO RUN TOO LEAN REPLACE THEM AND YOU SHOULD BE BACK IN BUISNESS
Start with the throttle sensor on the gas pedal, check with voltmeter one wire should have 5.0 volts one of the other should get more voltage as you press the gas pedal.
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