P0171

Technical Definition:

System Too Lean (Bank 1)

Trouble Code: P0171
Address: 0x0171
System: Powertrain
Subsystem:
Technical Description:

Possible Causes:

Possible Symptoms:

System Too Lean Bank 1

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Intake air leaks
– Faulty front heated oxygen sensor
– Ignition misfiring
– Faulty fuel injectors
– Exhaust gas leaks
– Incorrect fuel pressure
– Lack of fuel
– Faulty Mass Air Flow (MAF) sensor
– Incorrect Positive Crankcase Ventilation (PCV) hose connection

Specific Makes:

– Excessive Fuel Consumption

One thought on “P0171

  1. So I recently bought a 1995 Toyota Avalon with over 280,000 miles on it. So after getting gas today, my check engine light came on steady. And in addition the O/D OFF light was blinking for the first 40 or 50 miles I drove it after the check engine light came on. So once I made it to my friends house he hooked it up to his scanner and pulled the P1071 code. He cleared it for me, and all seemed well for a good 60 miles or so. Then all of a sudden on my way home the stupid check engine light came on steady again, accompanied by the o/d off light flashing again. The most recent work that was done on the car was $1,000 worth of brake pads, rotors and calipers front and back. Prior to that, I had to fix the missing O-ring under the radiator hose where it connects to the housing unit, because the check engine light came on the first time on me 20 minutes after I purchased the car. And it didn’t start 45 minutes after I purchased it. And it over heated on me 4 times on my way home. I bought the car 15 miles from my house! So I’m about a month into this venture and have NO IDEA what this code means exactly or how I need to go about fixing it. BUT I NEED my car!! Hence the reason I bought a car!! LOL So Any idea’s would be SUPER helpful and appreciated!!

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