Replaced Mass Air Flow Sensor on 2000 Boxster because check engine light kept coming on. Didn't fix the problem, now fault codes 1126 (oxygen sensing adaptation, lower load range, cyl.1-3) and 1130 (oxygen sensing adaptation, idle range, cyl. 4-6) appear. Does it do any good to remove sensors and try cleaning them or should I bite the bullet and just replace all four of them? Car has 109,000 miles on it. Thanks in advance for any suggestions - rPm

 

Never heard of anyone being able to clean them successfully, so you are probably looking at new sensors.

 

They dont last forever, and 109,000 miles is not bad for a set of 4 sensors to last.
Regards Big Bob