Question about 2004 Ford F250

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I need to reset the O2 monitors. I have done several "drive Cycles". What's next?

Posted by Anonymous on

  • Anonymous Apr 06, 2015

    Generic answer?? Monitors for O2 and O2 sensor heater "NOT READY". NO trouble codes listed or noted. CAT not involved, only 10 YO. ??????

  • Anonymous Apr 09, 2015

    Sorry if I was a bit snarky with the reply of "Generic answer?". There are no O2 sensors thus no monitors. I have since found out my TK is OBD I, NOT OBD II. Which entails a different testing method. I will say that "flashing" or a reset would not have helped me or others because all memory stored in the PCM would be gone and any progress acheived through "Drive Cycles" would have been lost. THANK YOU



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Take it to autozone or some such and they will run a reset for free

Posted on Apr 06, 2015


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Posted on Jan 02, 2017


SOURCE: my Cat, O2 and heated

There are no monitors for O2 Sensors

You must have other issues effecting
the sensors

If your cats are 15 years old,then there
is your problem. No Efficiency,Replace
worn out cat

Posted on Mar 15, 2011

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2002 Hyundai Elantra that says my on board computer is not ready to be tested. Emission results are: readiness- fail, monitor comprehensive- not ready, monitor EVAP not ready,monitor O2 not ready.

Did you recently clear the trouble codes or disconnect the battery? Once all codes are cleared, the computer will not display systems 'ready' until they go through an evaluation cycle. Some of the systems require a certain number of drive cycles before they will display 'ready'. A drive cycle is usually starting the engine from a cold start (based on coolant temperature) and driving until certain conditions are met. I don't know what the requirements are for your car, but my 2003 pickup truck requires more than 10 drive cycles before it will make the O2 sensors and evaporative emissions 'ready'. Most states only require that a certain number of systems are showing 'ready' to pass emissions certification.

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How many miles do i need to drive before my buick lesabre reset itself

Unfortunately it is not a certain amount of time or miles that the car needs to be driven.

There are several 'readiness monitors' that basically cover each emissions related system. For instance there is an EVAP monitor that checks the EVAP system and all of it's components under certain specific conditions (No VSS, TPS, O2 sensor, IAT, MAP, Fuel trim, Injector ciruit, EGR pintle position, ECT, or MAF sensor DTC codes set; Start up engine temp 40F-86F; gas tank between 15% and 85% full, Barometer above 75 kPa, system voltage 8V-16V).

So more information is needed as to what failed you the first time. What DTC code was triggered?

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02 sensor not ready,catalyst not ready

The catalyst is able to oxidize hydrocarbons (unburnt fuel) at about 600 degrees. The air injection pump routes fresh air straight to thecat to aid in speeding up the light off time. once there, the cat stays warm enough to oxidize at all times. The oxygen sensors have heater circuits built in (4 wire vs. the earlier 2 wire O2 sensors, this is why they're referred to as HO2S; Heated O2 Sensors) As for the term "Not Ready" this applies to one of the monitors run by the PCM the Emissions Monitor. EGR flow, O2 sensor operation, catalyst temp are all monitored by the PCM so it can decide whether it will run in Open Loop (ignoring O2 sensor inputs) or Closed Loop (adjusting fuel trim by reading the O2 Sensor input) To change a monitor status from "Not Ready" to "Ready" is as simple as driving as per TRIP guidelines. Once a TRIP is completed (a TRIP is an acronym don't remember what it is right now, but a TRIP is different than a drive cycle) then monitors will have completed and be "ready" unless there is a problem in which a DTC will be stored along with freeze frame data (Mode 6) and if enough key cycles for the individual code (Some are instantaneous, some are 3 key cycles, some are 5, and some are successive key cycles), then a MIL or Check Engine Light will turn on as well.
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