Insufficient catalyst 0402 code as soon as drive monitors set

Did someone reset codes and ECM, or disconnect the battery? Use Catalytic converter cleaner and then do a Drive Cycle.

https://www.google.com/search?q=2000+GMC+Jimmy+catalyst+monitor+is+incomplete

and Secondary Air Monitor information

https://www.google.com/search?q=2000+GMC+Jimmy+secondary+air+monitor+is+incomplete

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Replace the O2 sensors first, that may take care of the code you are getting saying catalytic converter. If you get the code after that I would think you would be able to just replace catalytic converter, but make sure the rest of the exhaust is clear. I have seen a piece fall down inside a muffler and plug it off giving problems also.

After the MIL is turned off or the battery was disconnected for some time, all monitors are set to incomplete. However with several short trips with engine getting at least to hot enough for thermostat to open, (I believe 8 is the magic number of trips) most monitors are set, you may be able to pass the test with only one incomplete only.

louie ramirez if the monitors are not resetting right away its because something was repaired recently to do with the emissions and a trouble code was erased or cleared to remove the check engine light .now there should be no more check engine light on but you have monitors blinking on your scanner right ,now to turn those monitors off all you have to do is drive the vehicle and monitor with a scanner some cars clear right away and some can take up to 500 miles before the monitors clear ,don't panic its this a typical normal procedure just drive it should clear soon and good luck.
Apr 02, 2014

Duplicate question.

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.

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!

the best way to reset it is with a scan tool.
disconnecting the battery for one minute will also remove the code.BUT
if your smog test uses an OBD scan as part of the process,then there will be a problem,because the monitors will not have been set,as they are reset if the battery is disconnected..
most tests allow only one monitor missing,and not the catalyst .
A drive cycle will have to be done to set the monitors.
Typically cold start coolant temp less than 50F,idle for 2 minutes no air condition, accelerate at half throttle to 50mph then drive 3 minutes with a/c on at 50mph steady.decelerate to 10mph without using brakes..Accelerate to 60mph and drive for 5 minutes at steady speed without a/c
deccelerate without braking and drive for 1 minute at 40mph.
stop the car ,use braking.
Shut off the car and add 4 gallons of gas.do not shut off the car for more than 5 minutes.
drive in 3rd gear or overdrive off with rpm 3000 for 1 minute.
decelerate to 10mph.without braking
accelerate to 40 mph in 4th gear.,or overdrive on
decelerate without braking to 10mph.
test complete.
this will set the o2 sensor heater ,o2 sensor,catalyst,evap purge.and the other monitors.

The downstream O2 sensor will probably fix the catalyst efficiency code. That code usually pops up when a new sensor is on the front and the old and slower sensor is still on the rear. The PCM compares them to decide if the converter is working. The airbag and cruise is probably a bad clockspring. It lives right behind the steering wheel. Disconnect the battery before attempting repairs on the airbag system for your own safety. You don't want an accidental deployment while working that close. I hope this helps.

I am in Virginia but I believe you vehicle is showing a monitors not ready for Catalyst & Evap. If that is correct you need to basically drive the car a few days. The computer will remonitor itself and should be fine following that. Most drive cycles require highway driving & city driving. Make sure you turn on a/c as well. Its not how many miles you drive but what conditions you drive that sets you monitors. You could locate the drive cycle and attempt to replicate it but its usually very difficult drive exactly as the cycle asks. Good luck.