![]() The Evap Monitor is the hardest to clear, however, most states allow 1 Readiness Monitor to not be clear, CA now will allow the Evap Monitor to not be clear for SMOG testing. Often you will need at least 2 Run Cycles to complete most of the Readiness Monitors. Try to have the fuel tank filled between 3/4 & 7/8 of a tank. ***8226 Large fluctuations in throttle angle The diagnostic routine shown above will be discontinued whenever: Before shutting engine down, allow it to idle in gear for approximately 5 minutes. I prefer to find a flat road without much traffic and set the cruise control at 45 MPH and drive for 3-5 miles and see if the O2 sensors and Catalyst Monitors clear.ĥ. A good car only needs 3-5 miles if the O2 sensors are working properly. Accelerate to 40-50 MPH and maintain a steady speed for 15 minutes. ![]() Accelerate to 20-30 MPH and maintain steady speed for 3 1/2 minutes.Ĥ. You can attempt #3 & #4 during this warm up period.ģ. Drive the car around normally for 10-15 minutes to fully warm up the engine. Start engine cold from sitting overnight and allow the engine to idle normally for 2 minutes.Ģ. I would suggest that MY Drive Cycle be followed, posted below.ġ. This is REALLY not that hard, if the car is in good shape and has been maintained. ![]() MANY problem cars have original O2 sensors after 10-15+ year and 150-250k+ miles. If it doesn't, then depending on the year and DME in the car, the Pre-cat O2 sensors are probably lazy and/or there is a problem with the SAP system. The SAP Readiness Monitor should turn to Ready/Pass/Clear on the first cold start after sitting overnight. If a Pending code or a Permanent Hard code is triggered, the Readiness Monitor process will be stopped. Trying to drive the posted Drive Cycle posted all over the Internet is chancy IMHO.ĮVERY time codes are cleared whether or not the SES/CEL/MIL is on, the Emission Readiness Monitors are RESET. I am talking about 7-15 miles of driving. A "good" car can have ALL but the Evap Readiness Monitors Complete in 1 drive if the O2 sensors are fresh and active, the SAP system works and there are no Lean codes. Doesn't ANYONE know the REAL TRUTH - please and thanks?ĭriving hundreds of miles is NOT the answer. IF that fixes things, I'm HOPING that I can figure how to get things to pass by KNOWING what I'm doing instead of just driving around wasting time and gas to get it done. So I drove about 80 miles in about 8 trips, thinking it should get it - NOPE! While trying to add more, the 142x errors returned, and - funny thing - seriously ROTTEN vac hose behind block. Write your congressman.Well, I've been TRYING to find a more DEFINITIVE answer to: Just WHAT, EXACTLY, does it take to get all the necessary sensors to acquire sufficient data to PASS the CA Smog Check - after doing the necessary repairs AND clearing all the codes? Initially I had an intermittent 1421 & 1423, which I now understand (but couldn't find it initially, so let it slide with an occasional CLEARING of the CEL with my UltraGauge.) Making the mistake of clearing the CEL before driving to the smog station (23 miles away) I was told I had to go drive the thing 50-100 miles in order for the O2 and catalyst sensors to accumulate data. Then the emission laws will become a little more "user friendly". We need to elect reps who work on there on cars. My State, Delaware, has a zero tolerance policy. I suppose that's why some state's or county's DMV's allow up to 2 incomplete monitors before you fail inspection. No one should have to drive for 700 miles and 10 days for anything as stupid as this. This procedure definitely needs to be improved or the OEM's need to create a "forced immediate diagnostic". Then on Tuesday of the follwoing week, as I was driving to work, I noticed that the EVAP SYSTEM was reading OK. I did not touch or use the car for about 36 hours one weekend in July. I even read one site which read like an authentic OEM procedure and they said not to even open the doors of press the remote key FOB device. What worked for me back in mid-July was following the Cadillac GM Forum where they required a minimum of 17 hours of non-use. I did erase some codes for an un-related matter about 5 or 6 days ago. I just checked my monitors and the EVAP Readiness is incomplete.
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