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2 Posts
Hello all,
First time poster and first time BMW owner. We have a 2002 325xi for my kids' daily driver. While leaving the neighborhood, the CEL came on along with the transmission cog light. Car stopped moving. After turning off the car and letting it sit for a while (as per the manual), the cog light cleared and the car was able to drive back home. I checked the CEL codes this morning and found the following codes along with the cog light back on:
P0491 - Mass air flow sensor low flow limit detected bank 1
P0492 - Mass air flow sensor low flow limit detected bank 2.
I cleared the codes and tried shifting the transmission through all the gears. When moved to "manual" S D is displayed before cycling through M 1-3. I decided to try and clean the MAF. I have read on the forums that the MAF and can and can not be cleaned with MAF cleaner depending on the thread I found. After cleaning the MAF and re-installing, the cog light disappeared, but transmission still showing S D when shifted to "manual". If the car is rev'd to ~ 1500 rpms, reverse will start to grab and then give way, same deal with third gear. I know based on what I have read that the MAF is used to calculate the engine load and then in turn regulates whether the transmission will work or go into safe mode.
So my question is, do is still have a MAF issue even though i have yet to throw and set of codes? I have pulled the battery cables to reset the computer, but the trans remains in safe mode. Scanner shows the MAF reading at idle is ~ 3.2. Not sure if this is good or bad. I saw a spike of ~ 5 while rev'ing the engine. Since I can not drive the car, I can't get any different readings.
First time poster and first time BMW owner. We have a 2002 325xi for my kids' daily driver. While leaving the neighborhood, the CEL came on along with the transmission cog light. Car stopped moving. After turning off the car and letting it sit for a while (as per the manual), the cog light cleared and the car was able to drive back home. I checked the CEL codes this morning and found the following codes along with the cog light back on:
P0491 - Mass air flow sensor low flow limit detected bank 1
P0492 - Mass air flow sensor low flow limit detected bank 2.
I cleared the codes and tried shifting the transmission through all the gears. When moved to "manual" S D is displayed before cycling through M 1-3. I decided to try and clean the MAF. I have read on the forums that the MAF and can and can not be cleaned with MAF cleaner depending on the thread I found. After cleaning the MAF and re-installing, the cog light disappeared, but transmission still showing S D when shifted to "manual". If the car is rev'd to ~ 1500 rpms, reverse will start to grab and then give way, same deal with third gear. I know based on what I have read that the MAF is used to calculate the engine load and then in turn regulates whether the transmission will work or go into safe mode.
So my question is, do is still have a MAF issue even though i have yet to throw and set of codes? I have pulled the battery cables to reset the computer, but the trans remains in safe mode. Scanner shows the MAF reading at idle is ~ 3.2. Not sure if this is good or bad. I saw a spike of ~ 5 while rev'ing the engine. Since I can not drive the car, I can't get any different readings.