Code P0171 means System to lean (bank 1)
po171--- system to lean (bank # 1)
P0171 System too Lean (Bank 1)
Trouble code P0302 means: Cylinder #2 misfire detected
Trouble code P0753 means: Shift Solenoid A Electrical
P0171 = System too lean (Bank 1) Look for a vacuum leak before you buy any parts.
p0505 code mean Idle Air Control System. And I need to know the information of your car, then I can help you.
Trouble code P0300 means:Random/multiple cylinder misfire detected
Fuel mixture is too lean. Could be anything from a vacuum leak, dirty MAF sensor, bad O2 sensor, etc...
Trouble code P0171 means: Fuel System Lean (Bank 1)
A P1406 error code on a 1996 Pontiac Sunfire indicates a faulty EGR valve. This can result in poor engine performance and should be replaced immediately.
Your system is too lean. That's what it will say on obd2 scaner tool. It means that your air to fuel ratio is too lean.