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Discussion Starter #1
These are the two codes P0171 p0411. I've looked online but no one is really clear. Couple days ago my car starting getting louder. Now the engine light is on and my car sounds really loud almost like I have a rip in my exhaust very deep muffler sound coming from the front driver/passenger side. What could this be? Also feels like my car has lost some power when trying to accelerate
 

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16555/P0171/000369 - Fuel Trim; Bank 1: System Too Lean

Possible Causes
Mass Air Flow Sensor (G70) defective
Intake System Leak(s)

Possible Solutions
Check Mass Air Flow Sensor (G70)
Check Fuel Pressure Regulation
Check Fuel Pump
Check Injectors
Check Intake System for Leaks
Check Exhaust System for Leaks
Check Secondary Air System for Leaks
Check Vacuum Pipes for Leaks




16795/P0411/001041 - Secondary Air Injection System: Incorrect Flow Detected
Possible Symptoms
Malfunction Indicator Light (MIL) ON

Possible Causes
Fuel Pump Relay (J17) faulty
Hoses/Pipes to/between Components faulty/clogged
Secondary Air Injection Pump (V101) faulty
Secondary Air Injection Pump Relay (J299) faulty
Secondary Air Injection Solenoid Valve (N112) faulty

Possible Solutions
Check Fuel Pump Relay (J17)
Check Hoses/Pipes to/between Components
Check Secondary Air Injection Hoses/Pipes for Carbonization
Check Secondary Air Injection Pump (V101)
Check Secondary Air Injection Pump Relay (J299)
Check Secondary Air Injection Solenoid Valve (N112)

(rosstech wiki)


This happened to my car when I first got it too. I had an exhaust leak, it might of had to do with the flex pipe, I cant remember. But if its getting loud, you most definitely have an exhaust leak. That could be causing other problems too. Your MAF might be dirty as well. You also could have a vaccuum leak.

I would start off by inspecting your exhaust. Also, pick up a can of MAF cleaner (there is a DIY on this sight on how to clean you Mass Air Flow sensor) and clean the MAF. Visual inspection of the exhaust and intake system would help. You might be able to hear a vaccuum leak. But definitely start with the exhaust.
 

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Discussion Starter #3
Also when I'm in idle my rpm needle moves up and down not much at all barely actually. Like a centirmeter up and down!
 

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because theres a problem with the MAF, and your car has vaccuum and exhaust leaks. sos do as i said in the first post. check exhaust, clean maf, check vaccuum lines.
 
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