Question about 1999 Dodge Intrepid

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

These monitors were not ready, and caused me to fail inspection. What should I do?

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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.

Posted on Mar 10, 2009

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2 Answers

Why do i get OBD/READINESS, Not ready?


Alan, I f you have had battery disconnected or had some one erase codes recently, the computer has to go through what is known as a drive cycle to complete all monitors cycling, some vehicles complete cycle in 10 miles, where as some could take 100 miles or more.
My Toyota EVAP readiness state will not cycle in cold weather and takes thousands of miles before it gets to readiness state.
I think some shops can force systems to run if they have a good scan tool.

Mar 06, 2016 | Cars & Trucks

1 Answer

Hello again. I have the 2006 Nissan Altima 2.5S ......ok I had the issue bank 1 sensor 2 heater circuit low P0037 is the code I was getting. But when I connect the code reader it says that the heated 02...


O2 Emission Monitors & Evap Monitor-- are two
different systems

Get ALL your OBD Codes & work them one at a time,
& DO NOT Clear any data with code reader or removing
battery cable, or the monitors ALL have to run again

The heater may work in the sensor, but the sensor doesn't
switch fast enough or is worn out & the front sensors get
replaced at 100,000, before they fail or slow down

The Evap Codes will be needed, to work on that issue
That monitor runs last & only every few days

IF--- you had professional scan tool software, you would see
11 monitors & maybe 8 that run on your vehicle

There will be at least 2 for the O2,one for cylinder misfire,
one for evap, one for egr,& three others

Oct 21, 2014 | 2006 Nissan Altima 2.5

1 Answer

No no it wasn't because of the O2 sensor that it didn't pass it was a couple of things that came up and the we're Catalyst not ready Monitor Evap not ready Monitor O2 not readyz


You have 8 I/M or Emission Monitors that have to run clear
BEFORE you can go to inspection

Your Catalyst Efficiency comes from the switching comparison
of the front & rear oxygen sensors being out of range

Until you resolve the rear O2 Sensor Heater Issue you won't
know if the cat is good or you have other problems

You need professional scan tool software & a long road test
to even find a problem,then component test,which apparently
wasn't done when they hung the new rear sensor on based on a code

Apr 30, 2014 | Cars & Trucks

1 Answer

Catulyst monitor and evap system monitor and oxygen sensor not ready also P0501 code


Diagnostic Test Code (DTC) P0501 "Vehicle Speed Sensor Range/Performance"
DESCRIPTION
The Wheel Speed Sensor (WSS) generates a waveform with a frequency according to the speed of the vehicle. The signal generated by the WSS informs the ECM not only if the vehicle speed is low or high but also is stopped the vehicle or not. The ECM uses this signal to control the fuel injection, ignition timing, transmission/transaxle shift scheduling and torque converter clutch scheduling. Also the WSS signal is used to detect rough road driving condition.

Whenever Your OBD readiness monitors cannot complete it is because there is a problem that is affecting fuel mixture, ignition timing, or any other fault that can affect the level of tailpipe emissions. Once these faults are repaired, then the codes must be ereased so that the monitors can run and "re-test" the system to check for the same, or any other faults. The goal is for all the monitors to run and change to "complete" without any fault codes present.

In your case, the wheel speed sensor fault needs to be diagnosed and repaired so that the monitors will complete. Also note that one incomplete monitor can prevent other monitors from running. In your case, the catalyst monitor cannot run because the O2 sensor monitor is not complete. The catalyst monitor can only run AFTER the O2 sensors have received a "clean bill of health" from the O2 sensor monitor. The wheel speed sensor problem is keeping the O2 sensors from being tested.....So the wheel speed sensor problem is pretty much causing the whole thing.

Here's the kicker...If the vehicle has been driven in this condition for a period of time, there may be damage to the catalytic converters. The computer does not know this yet because the catalyst monitor cannot run. So it is possible that you can fix the wheel speed sensor thing, the O2 sensor monitors will complete, then when the catalyst monitor runs it could set a "catalyst efficiency" code. Then you will have to replace your catalytic converter to fix that. I'm not saying that this WILL happen on your vehicle, I am just saying that it CAN happen so you will not be confused IF it DOES happen. I see this all the time, and I have had customers accuse me of doing something to their car so I could sell them a high-dollar catalytic converter. This is simply not the case...I had no way of knowing that the converter had a problem because when I first received the car, the catalyst monitor was incomplete and there was not catalyst code present at the time.

So the only way to do this is to correct ALL fault codes one at a time until all monitors are complete and no fault codes are present.

Sep 17, 2011 | 2004 Hyundai Elantra

1 Answer

My 2003 Toyota Solara will not pass inpection because the EVAP and catalyst monitors won't become ready. I have driven over 400 miles on highway and another 90 around town and have done a Toyota recommened...


Both of these monitors won't run until the oxygen sensor monitor has run. The oxygen sensor monitor won't run if an Engine Coolant Temperature (ECT) sensor Diagnostic Trouble Code (DTC) is stored. So, did you replace the errant coolant temp sensor? I take it you did and reset the codes. But you need to check the codes again and see if there are any that returned or are pending. A pending misfire code will not allow the oxygen sensor monitor to run. (Pending codes will not turn on the check engine light.)

This information is from Haynes Techbook "OBD-II" (No. 10206) Chapter 6, p. 14-16
(Highly recommended reading!)

Feb 06, 2011 | Toyota Solara Cars & Trucks

1 Answer

Oxygen sensor, erg, and catalyst readiness monitors wont reset


possible oxygen sensor clogged/clogged egr port should solve catatlyst readiness .

Jul 19, 2010 | 2000 Dodge Grand Caravan

1 Answer

1999 Subruban 1500 LT Failed Emissions Test: Catalyst Not Ready EVAP Not Ready O2 Sens HTR Not Ready EGR Not Ready Fault Codes: No codes Present -------> Check Engine light is not on.


You may have a defective coolant or air temp sensor. These need to be accurate in order for some of the monitors to run. Your going to need a diagnostic scanner to see the data so you can determine what is wrong.

If you had replaced or unhooked the battery just pryor to geting the smog then thats the problem. Just drive the truck for a couple days and you should be fine.

You will still pass the test if you still have 2 monitors not set. California allows that. 3 fail

Feb 18, 2010 | 1999 Chevrolet Suburban

1 Answer

Monitor Reset


The following conditions must occur to complete a Trip and test all OBD II monitors and components including the Catalyst Efficiency Monitor:
-- The misfire, comprehensive component, and adaptive fuel monitors are checked continuously from engine warm-up and can complete any time.
-- The exhaust gas recirculation (EGR) monitor test requires a series of idles and accelerations.
-- The heated oxygen sensor (HO2S) monitor requires a steady speed drive for approximately 1 minute at 30 to 40 mph.
-- The catalyst efficiency monitor requires a steady speed drive for 1 minute and 20 seconds beyond the HO2S monitor test at 40 to 65 mph.
If you cut engine off before test are completed then you must wait for a 6 hour cool down before monitors will run again.

Feb 06, 2009 | 1996 Nissan Quest

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