MAF Sensor check

tylka · Post by **tylka** » 08 Dec 2004, 09:59

Is there a way to check the MAF sensor? Also would a 121 code (MAF sensor signal absent or faulty) be caused by a bad O2 sensor? I have a new O2 sensor on the way, but have not yet recieved it. Thanks for the help.

Tsquared · Post by **Tsquared** » 08 Dec 2004, 17:52

tylka wrote:Is there a way to check the MAF sensor? Also would a 121 code (MAF sensor signal absent or faulty) be caused by a bad O2 sensor? I have a new O2 sensor on the way, but have not yet recieved it. Thanks for the help.

Pulled this from a post from "nightshift" when he had a code 121 for the MAF: "The only reading you get is between #1 and #2 terminals of the 4 (they are stamped and numbered on the unit) results:

Old MAF between 1&2 = 9.4 ohms
New (used) MAF = 10.6 ohms
I installed the new/used one, and the car ran beautiful, end of problem.

My thoughts would persuade me to beleive that if you get this code, anything say in the 9.5 range, maybe below 10 ohms is a good sign the MAF is actually shot, along with first running it with the MAF connected and disconnected. "

I have had the 121 code and been able to clean the sensor and clear the code and be OK until I over oiled my K&N filter again.

See: https://www.matthewsvolvosite.com/chat/p ... php?t=2115