Thread: Bad MPG's!!
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Old 11-30-2012, 12:02 AM
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dwlink dwlink is offline
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Location: St. Louis
 
Join Date: May 2007
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Mein Auto: 530i
2 Other things to check:

Spark plugs - have they ever been replaced? If not, I would do this ASAP. Parts should be around $40ish and if its your first time you may spend about another $40 in getting all the right tools (ratchet extensions, spark plug socket, etc.)

Engine air filter - If you clean the MAF sensor, you'll certainly come across the engine air filter also. But, I would recommend checking out the engine air filter regardless. This is another easy DIY if it turns out your filter looks really clogged. I bought an AFE pro-dry S filter (the oiled ones can cause issues with the MAF sensor) and its been great for the couple of years I've had it in.
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