Codes P0106 and P0090

2003 MAZDA PROTEGE
176,213 MILES • 4 CYL • AUTOMATIC
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LISA FRANKLIN
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These are the codes that are currently on my car. The 1st reading said manifold absolute pressure, Barometric pressure sensor,range performance. P0171 Bank 1 system, too lean. P0090 fuel pressure regulator control circuit. What does all of this mean? Are all of these codes related to one problem or are they each individual problems? Also, could this be a co2 sensor problem. If it is which sensor would need to be replaced?
Jul 24, 2017 at 7:34 AM
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HMAC300
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These may be related because of a vacuum leak check for a leak like a broken hose/off/broken etc. The 171 code and 090 codes could be from regulator not working right and causing low fuel pressure. I am sending location of PRC solenoid and how to check it, but a vacuum leak can cause same thing so check that also. See link for checking fuel pressure as it may be a bad pump.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Jul 24, 2017 at 8:33 AM