Quote:
Originally Posted by jfoj
The Evap monitor is the hardest/slowest monitor to clear. It will clear in the the next few days if the fuel tank is at least 1/2 full (but I target 3/4 full) and the driving condition are met. The Ambient Air Temp sensor need to be working and the Evap Monitor typically requires at a minimum 2 drive cycles, but can take 6+ depending on the conditions. If there is a problem with the Evap system you will have a code set before the Monitor is set to Ready/Pass/Clear.
I would not worry about anything at this point as long as you get the car inspected before a Pending or hard code is triggered.
The fact you had a Pending O2 sensor code likely means you have a lazy pre-Cat O2 sensor. The most common O2 sensor codes are for heater problems, but these are rarely Pending. O2 sensors are "consumable" and it is recommended they be replaced every 100k miles. I would focus mainly on the pre-Cat O2 sensors as the post-Cat are really for catalytic converter monitoring and can be a PITA to route the wiring.
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Yea, I would like to get them replaced, I do not want to ignore any problem, and I thought it was strange that it was just pending. I searched the computer last night to see if the pending o2 code had come back but it hadn't. But maybe switching them out just because. Would you replace all 4 or just the Pre Cat ones?
I called BMW and they wanted just under $300 dollars for 1 of them. AutoZone carries a Bosche O.E. sensor or AutohausAZ has bosche ones. Any issues not buying it from BMW?