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See thee attached link for P0103 For P0137 recommend checking for exhaust leaks prior to O2 sensor, check cat to see if its plugged if both are good replace the sensor... if issue persists you have a wiring issue or PCM issue.
They sell a spray cleaner at parts stores its in a spray can with a tube How effitive it is im not sure i mean i have never seen it fix one that wasn;t working but could give it a try How ever Po171 is not the code for the mass air flow sensor its fuel trim lean bank 1 O2 sensor is reading MAF would be PO101-PO103 any of those three codes
well on my car these are reffering to the sensors in the exhaust, the upstream sensor(before the cat) and the downstream sensor(after the cat) the downstream sensor can act up if it is lazy or sluggish, or due to a bad catalytic converter or a clogged one. however there are sensors on the exhaust manifold which are determined by driver side or passenger,my opinion is to get a scanner for about $100 to $150 and you can figure out many of these codes yourself.