Question about 1996 Ford Probe

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I'm having trouble passin the local emissions because I keep getting a catalyst not ready from the ECM, I've run the drive sequence several times. How do I fix this? I was told to replace the rear manifold cause the mini catalyst is bad. I'm trying to find the rear exhaust manifold for sale so that I can replace mine.

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In some cases the converter is good but the sensors that monitor them go bad over time the oxygen sonsors get slower to respond or stop all together theyre supposed to switch signals 60 -80 times a second so a small lag can be big trouble check your air filter change it if its been a while the same with a tune up but most important get your oxygen sensors checked out hope this helps good luck

Posted on Aug 22, 2010


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Monitor catalyst-EVAP-O2 not ready 2004 suzuki/vitara, Emissions results

Check the o2 sensor first. If it is ok, drive your more than 45mph on freeway for half an hour see it is back on? If still not battery and ECM should be checked. Hope it can help.

Dec 19, 2013 | Cars & Trucks

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Need the correct number and or location for the PCM fuses and the heated O2 sensors,EGR Vaccum regulator, EVR solenoid, camshaft positionsensor fuses on a2003 focus in the interior and exterior fuse b

To start with, if the check engine light is not on, you probably don't need to check any of the components.
The engine and systems have to get up to operating temp and go thru the closed loop program a few times before the exhaust can be checked.
The printout you have says the engine and exhaust have not been hot enough yet.
The correct process to make the components ready to test is - drive at 55 mph for at least 12 min with no stops or variance in speed. Then 0-35 mph at least 4 times, and make sure you make complete stops each time. This should run the emissions system thru a complete drive cycle.
Some state testing is different so check with your state.

Feb 13, 2013 | 2003 Ford Focus

1 Answer

Not enough data in computer for emissions testing

Has the battery been disconnected, or has it gone dead? Every time the battery is disconnected, all trouble codes are cleared, the check engine light is turned off, and all system monitors are reset. For the monitors to get back to a 'ready' status, the vehicle needs to go through one or more (sometimes quite a few) drive cycles.
When you go to the emission station, they check for codes, AND also check to see how many of your monitors are in a 'ready' status. (This keeps people from disconnecting the battery, and thus clearing any trouble codes, in order to pass emission tests).
If you have not disconnected your battery for a while, but the monitors are still not showing 'ready', you need to have a qualified shop check out your computer and other electronic systems.

Aug 30, 2017 | 2001 Chevrolet S-10

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"
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

I need to have an emission test on a honda element 2004 and the drive cycle needs to be done to get the information, I had a battery change and it erased the information

drive cycles are done while you are doing normal everyday driving. the only reason an emission test would fail is if your check engine light is on. a local autozone or advance store should be able to hook there engine scanner up to tell you if any catalyst monitors have failed and check for trouble codes.

Jul 14, 2011 | Honda Element Cars & Trucks

1 Answer

I can't get an inspection sticker for my car because it keeps failing inspection because the computer will not reset. Every time it does the same thing. When they test the OBDII Readiness it says the...

Every time you reset the light or disconnect the battery it completely resets the system and it has to go through EVERY test again. The O2, EVAP, and Cat tests are generally the LAST THREE tests that are tested. You're not doing yourself any favors here.

Essentially what these readiness monitors are is the computer's notation that his has run the self diagnostics on each system and that the results feel into the expected results. If it is outside the expected results the computer will generally try to run the test multiple times before setting a DTC and turning on the Check Engine Light. It cannot set the status to "Ready" until it has a successful test within expected results; sometimes multiple successful tests. Sometimes, the tests need to run at different speeds - so the vehicle has to be driven not only at freeway speeds, but also city speeds for the tests to complete properly.

The O2 test MUST complete before the Catalyst test can run. The EVAP test generally requires that you have your fuel level at between 1/4 and 3/4 and that the vehicle sit undisturbed after being driven for a period of time for no less than 8 hours in order to run the EVAP test.

The same can be said for the O2 test sometimes because the computer needs to test the O2 sensors reaction to heating up and cooling down. Eventually they will all complete - unless there is an issue. I have seen where a component was in the process of going out and the computer was getting both GOOD and BAD results when running the tests. As a result it wouldn't set ready status because it wasn't getting the concurrent GOOD test results.

As a Texas Recognized Emissions Repair Facility - my shop sees this kind of stuff all the time.

Good Luck.

Jun 01, 2011 | 2006 Mazda 6

1 Answer

Check enging light on 2003 Acura TLS doesn't come on when starting car. Failed emmision test because of it.

There is a problem with your OBDII (Onboard Diagnostics -2) system. The only way to find out why your Check Engine light is on is to scan your engine computer and find out which part of the system is failing. There will be fault codes stored in the computer to tell you. The failing system will then need to be diagnosed to locate the actual cause of the failure. Once this is completed, the computer will have to be reset, and the car will have to be driven (sometimes for several days) to get all of the computer monitors to run and recheck the system. If the repairs are successful, the same codes should not return. You may have new codes show up however. This is because some of the monitors are unable to run if the check engine light is on due to another failure. Sometimes a code like "Catalyst Efficiency Below Threshold" will show up when they were not there before. This is because driving the vehicle with the Check Engine light on has destroyed the catalytic converters, but the code could not set previously because the catalyst monitor could not run to test the catalyst when the other problem was present. Now that the first problem has been corrected, the catalyst monitor now runs and has determined that the catalyst has been damaged.

This why I tell all my customers that the best time to get your car ready for an emissions test, is the minute the Check Engine light comes on. Ignoring this light and driving the vehicle with it on can damage some pretty expensive parts, as well as possibly costing you fines for not getting your vehicle "Legal" when it is time to renew licenses, etc. I live in Missouri, and you cannot renew your license plates without passing the emissions test - people wait until the last day to renew their registration and they get angry with me when I tell them it is going to take several days and possibly even a couple weeks to get their car to pass. It's not MY fault!!! THEY are the ones who chose to ignore the warning lamp!

Feb 06, 2011 | 1996 Acura TL Series

1 Answer

Can't pass emissions inspection


Apr 29, 2009 | 1998 Mazda Millenia

1 Answer

1992 suburban not passin emission testing

Could be the ECM that controls the fuel supply and mixture to the throttle body .

Dec 17, 2008 | 1992 Chevrolet Suburban

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