Question about 1996 Nissan Altima

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I have a Nissan altima 96' and it doesn't pass emissions test says readiness monitors were not set : catalyst, oxygen sensor, EGR system. how do i fix these things

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Drive the car 500 miles and take it back

Posted on Sep 29, 2009

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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

2004 dodge stratus 2.4L not passing emissions test why Emission saying Catalyst Not Ready Oxygen Sensor Not Ready I put 375 highway miles on the car, hopping this will pass it.


Again, TOO LITTLE INFO!!!

could be a non operating oxygen sensor heating, check connector and damaged wiring, as it is posible to damage wiring or connector at this very hot plecement. Amclaussen.

Sep 27, 2013 | 2004 Dodge Stratus

1 Answer

EGR Monitor will not reset


Hi Sandy, I'm glad to help!

Sandy, If you have an EGR Monitor that will not set then most likely there is something wrong with the EGR System. There are several things that can cause this depending on the vehicle and engine type. (1) Bad EGR Valve. (2) EGR Vacuum Solenoid. (3) EGR Vacuum Solenoid Wiring problem. (4) EGR Flow problem due to restriction from carbon build-up. These things must be addressed one by one and repaired before it will ever run that monitor. To answer your question you can GOOGLE your vehicle year, make and model and engine for monitor drive cycle and it will show you how it must be driven exactly. Hope this helps and have an awesome day Sandy.

Apr 20, 2013 | 1999 Nissan Altima

1 Answer

EGR Monitor will not reset


Hi Sandy, I'm glad to help!
Sandy just a week ago I fixed a Mitsubishi with the same problem. The EGR Monitor would not set, it turns out the vacuum solenoid that goes to the EGR Valve was bad. I replaced for the lady and it fixed the problem. NOTE: I can't say that is what's keeping your monitor from running. BUT, its a real cheap fix and worth a try, don't you think. Hope this helps and have an awesome day Sandy!

Apr 20, 2013 | 1999 Nissan Altima

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

Can't pass emissions inspection


TRY DISCONNECTING THE BATTERY CABLE SO THE PCM (COMPUTER) RESETS TO ORIGINAL DEFAULT VALUES. HOPE THIS WORKS FOR YOU. GOOD LUCK

Apr 29, 2009 | 1998 Mazda Millenia

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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