Try this page: OBD-II Trouble Code: P0175 System Too Rich (Bank 1)
Basically:
Symptoms
You will more than likely not notice any drivability problems, although there may be symptoms such as a misfire.
Causes
A code P0175 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 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
* Clean the 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)
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Have fun...
Bad Bent
'91 Metro, rescued from trip to junk yard. SRD pulley, Header. 3Tech 9mm plug wires, 218/350 cam, +10 gear, Bosch Plat. +4s, FlameThrowerII. K&N, Optima, Catco, Jones glasspack, KYB, Ram Air, Vortekx Generators, Air dam, 7mm ground wires. No TB bridge. No A/C - Roof scoop works. '96 Metro, The Wife's car: 3Tech "econo" cam, +10 gear, SRD pulley, K&N, KYB, Bosch, Magnaflow, Syn. & grounded. No TB bridge.
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