Took the car for a smog test and the "OBDII Monitors Not Ready". FAIL!

No codes, so should I replace all four O2 sensors?

 

have you recently disconnected the battery? do you have an aftermarket tune on the car? if you disconnected the battery you have to do a drive cycle to reset the monitors. if you have a tune you may have the rear cats turned off. tuner will have to turn them on.

what was changed since the last time you did emissions?

 

i agree you should first attempt to reset the monitors before swapping out parts. you could've have been driving issue free all this time and still have "not ready" on some portion(s) of the obd readout.

do you know/remember the reset protocol? it's a pita but try it first, is what i would do.

in case its not handy, here it is:

Start engine, let idle for approx. 2 min, 10 secs.

Accelerate to 20-30 MPH, Maintain steady speed for approx 3 min, 15 secs.

Accelerate to 40-60 MPH, Maintain steady speed for approx 15 mins.

Decelerate and come to a stop. Then:

Idle in Neutral for 5 mins. (manual trans.)

During the drive cycle, do not exceed 3,000 rpm or 60 mph.

 

I have not disconnected the battery in a couple of months.

The car is tuned and have passed all smog tests in the past.

 

^^^Never knew about this. Will give it a try.

 

provided there's nothing wrong with the car ( o2's etc ) it will do the trick. the real trick actually will be maintaining those EXACT speeds without interference from other traffic.

i had to do it at 4 am to be able to maintain those speeds at a constant. it worked perfectly, and in about a 1/2 hour. good luck w it.

 

Call me if you are still in trouble bud. I'll help you out.

 

PLAN A: I was on the 118 Freeway doing the procedure. Going to the smog station this later morning to see if it worked.

Thanks.

PLAN B: Sam

Thank you for your offer.

 

I had the same problem. Pick up an OBD scanner that can check your I/M monitor status. I picked up an Innova 3100i, plugged it in, drove around until all I/M's were green, and passed smog. It'll save you a bunch of trips to your smog place.

 

[QUOTE=996TWINS;4401506]PLAN A: I was on the 118 Freeway doing the procedure. Going to the smog station this later morning to see if it worked.

Thanks. QUOTE]


ha the 118 is about the only fwy you could've done that on!


hope it worked, it should've! also, a good idea ( as uschoice mentioned ) always carry a small code reader beforehand. always check before they plug you in. since if "the"y want to be a**holes about it, they can log a "fail" just for the codes not being in "ready".


please let us know if it worked! GL!

 

Sorry, it did not work. Thanks for the advice. Will give it another try this weekend.

The Durametric or PWIS will read which O2 sensor(s) may be faulty. Apparently, the smog test station equipment cannot.

I need to go next week to get my fluids changed at my indy shop anyway. So hopefully this will be cleared up.

Thanks again guys.

 

I had this issue after a battery disconnect, too. The readiness monitors can take months to clear on their own. I was allowed one fault to pass, so I was OK. I monitored them for months after with the scan tool US Choice suggested and they were not ready every time I checked. Then when I went in this spring they had finally become ready. It took a lot of driving and many months - the better part of a year. I did the drive cycle reset several times with no luck and I drive the car a lot on top of that. They must have cleared in the fall.

 

sorry to hear. sg will sort you out. again, GL.

 

I will ad that O2 sensors have a life on them. If your car is higher milage, you are probably due. I think sensors are rated for ~60K tops and with some of the tunes we run and hotter gasses being passed over the sensors, life expectancy may decrease.
Typically this is what is being read for readiness:

M - Misfire
F - Fuel System
CC - Comprehensive Component

The following (5) Monitors were in a Non-set (flashing) condition:

C - Catalyst
EV - Evaporative System
2A - Sec. Air System (SAI)
O - Oxygen Sensor
OH – Oxygen Sensor Heater

Sensor may not be your only problem. Make sure you check for leaking exhaust or around sensor/catalyst also as this would return bad values.
Best way is to run durametric for parameters.

 

Yes, SG will fix. As usual.

Mileage about 66K. Figure I may just replace all four sensors to avoid bringing the car back to the shop more than once.