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Drive cycle oxygen status catalyst status

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6ya6ya
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Posted on Jan 02, 2017

01fordeb
  • 1033 Answers

SOURCE: I had both the oxygen sensors replaced on my 2001

Converters may be bad.

Posted on Feb 25, 2010

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I scanned my car but got no codes. Catalyst mon INC, H/D Catalyst n/A, sec air system N/A, Oxygen sens mon INC, Oxygen sens HTR INC, ERG/VVT sys mon INC. any help would be appreciated. thanks


INC means the self tests that the ODB system runs are incomplete. N/A means those systems are not tested on your vehicle. If all codes are reset/cleared, or if the battery has been disconnected, the computer will run all the diagnostic tests to establish that the systems are working properly. In most states, most of these tests must be completed with no trouble codes detected before passing inspection. You will have to run the car through a number of 'drive cycles' to get all the tests completed.

Feb 02, 2016 | 1999 Ford Taurus

1 Answer

Cant pass emissions,i need at least one of the not ready status to become ready status out of the oxygen senson, evaporative system, catalyst


drive it. I am betting you have recently "cleared" codes which also clears readiness monitors in an attempt to better control people cheating the system. After enough drive cycles are reached the monitors will pass if nothing is wrong and turn to ready. If the problem that the codes implicated where not fixed than the check engine light will again come back on and you will again fail your attempt to pass emissions.

Drive it for a week or so and see what happens.

Aug 15, 2015 | Cars & Trucks

1 Answer

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.
Hope this helps

Mar 08, 2013 | Cars & Trucks

1 Answer

How many drive cycles required to reset my 2009 Toyota Carolla?


Non ---with oxygen sensors-- if they work correctly

State Inspectors are not auto techs--- they have to
keep the line moving

What codes do you have & what did the insp
report say?

Nov 30, 2012 | 2009 Toyota Corolla

1 Answer

My 2000 Saturn did not pass inspection due to evap. and O2 sensors "Not Ready". How can I fix the problem or how can the problem be fixed?


What is the EVAP code?

The O2 are not ready because it takes some time for them to complete there self check after clearing trouble codes. This will involve a few drive cycles. Once the evap problem has been resoled, the check engine light cleared, you'll have to drive it for a couple of days to get everything in the "ready" status.

Sep 27, 2010 | 2000 Saturn SL

1 Answer

Vsc and check engine light is on . Had it read and code p0420 came up. Autozone said it could be an air leak in exhaust, AF sensor error, fuel system fault or faulty catalytic converter. Is there a cheap...


DTC P0420: Catalyst System Efficiency Below Threashold (Bank 1)

The ECM uses sensors mounted before and after the three-way catalyst (TWC) to monitor its efficiency. The first sensor, and Air Fuel ratio (A/F) sensor, sends pre-catalyst A/F ratio information to the ECM. The second sensor, a heated oxygen sensor (O2S), sends post-catalyst information to the ECM. The ECM compares these two signals to judge the efficiency of the catalyst and the catalyst's ability to store oxygen. During normal operation, the TWC stores and releases oxygen as needed. The capacity to store oxygen results in a low variation in the post-TWC exhaust stream as shown below.
If the catalyst is functioning normally, the waveform of the heated oxygen sensor slowly switches between RICH and LEAN. If the catalyst is deteriorated, the waveform will alternate frequently between RICH and LEAN. As the catalyst efficiency degrades, its ability to store oxygen is reduced and the catalyst output becomes more variable. When running the monitor, the ECM compares sensor 1 signals (A/F sensor) over a specific amount of time to determine catalyst efficiency. The ECM begins by calculating the signal length for both sensors (for the rear oxygen sensor, the ECM uses the output voltage signal length). If the oxygen sensor output voltage signal length is greater than the threshold (threshold is calculated based on the A/F sensor signal length), the ECM concludes that the catalyst is malfunctioning. The ECM will turn on the MIL and a DTC will be set.
Hope this helps :)

Oct 19, 2009 | 2005 Toyota Highlander

1 Answer

CAN YOU TELL ME WHAT THE P1000 CODE MEANS FOR A 1999 FORD F-150 PICK UP TRUCK


P1000 means a drive cycle has not completed, it will only clear itself after driving the vehicle through certain driving conditions. If you try to clear the code, it will reappear until you repeat the drive cycle. I am not too familiar with what AE will show, but if you can access Mode 6 data or the OBD Drive Cycle(These are two options from the IDS at Ford), It may help to show what tests have either failed or not completed. Heres what must be done to clear the P1000:


Note: The IAT PID must be between 10-38°C (50-100° F) during the OBD II drive cycle to enter into all the OBD II monitors. The FLI PID must be between 15% and 85% at all times.

Drive in stop-and-go traffic with at lease 4 idle periods (30 seconds each) while observing the status of the OBD II monitor on the scan tool. If the exhaust gas recirculation (EGR), heated oxygen sensor (HO2S), evaporative emission (EVAP), secondary air (AIR) (if applicable) or catalyst efficiency monitor have not completed, drive on the highway at a constant speed over 64 km/hr (40 mph) not to exceed 104 km/hr (65 mph) for up to 15 minutes. Heavy accelerations, sudden decelerations and wide open throttles are not recommended. If the scan tool sends out a three pulse beep at any time, the OBD II drive cycle has completed.

If there is only one certain component that hasn't completed its test, there are individual driving conditions to help those tests pass or fail if something is wrong.

Jun 23, 2009 | Ford F-150 Cars & Trucks

1 Answer

Monitors not ready: Catalyst,Evap System, Oxygen Sensor, Egr Syst


Drive it some more. Has the battery been disconnected/replaced recently? The Inspection station should be able to print you out a drive cycle to get the monitors ready also.

Mar 10, 2009 | 1999 Dodge Intrepid

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