P0172

[AVenom]

My SES light started coming on the other night, about a week after I changed my AEM air filter.
I'm hoping that the new filter is the cause of of the SES light coming on due to the MAF getting improper, or different reading than it's used to.
The first time it came on I cleared it, and it came back on exactly 24 hours later...actually it was pretty weird. It came on in the same place at the same time both nights on my way home from work.
It only comes on when I'm at highway speeds, and it's cooler outside.
Any ideas?

[customlowz]

System Too Rich (Bank 1)
What does that mean?

Basically this means that an oxygen sensor in bank 1 detected a rich condition (too little oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.
Note: This DTC is very similar to P0175, and in fact your vehicle may show both codes at the same time.
Symptoms

You will more than likely not notice any drivability problems, although there may be symptoms such as a misfire.
Causes

A code P0172 may mean that one or more of the following has happened:

• The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters (K&N, etc.) can cause the MAF to become dirty if the filter is over-oiled
• There could be a vacuum leak.
• There could be a fuel pressure or delivery problem

Possible Solutions

Possible solutions include:

• Inspect all vacuum and PCV hoses, replace if necessary
• Cleanthe MAF sensor. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
• Inspect fuel lines for cracks, leaks, or pinches
• Check the fuel pressure at the fuel rail
• Check the fuel injectors, they may be dirty. Use fuel injector cleaner or get them professionally cleaned/replaced.
• Check for an exhaust leak before the first oxygen sensor (this is unlikely to cause the problem, but it is possible)

[19Cutlass94]

Take a look at the MAF. More than likely its just gotten dirty and you can clean it off with no problem.