Error code P0171 P0441 P0116

Dear Techies,

I have a skoda fabia kompis 2002 , 1.4 60HK and now its time for yearly inspection test. The car has been giving low milage , 10km/1 liter max. I was in the workshop and they did a data test and found the three (3) error codes - P0171, P0441, P0116. the check engine light was on and off frequently.

The workshop told me to change Front Lambda sensor, Tempareture sensor exhaust system, AKF ventil/AKF Valve. The workshop gave me 1200 USD charge for that including service. So, I thought to do it by myself partial works.

After that I went to a small workshop and change the small joint pipe in the exhaust pipe which add two exhaust pipes. After that I did a OBDII error code erase with my Vgate VS450 scan tool and the codes are not coming back for 3 weeks and 200 km run. After the exhaust pipe fix the check engine light never come back for 2 months. But when I put the OBDII with ignition ON, its visible in the dahsboard. What does that mean ? This is my first question.

Second question, shall I change the parts recommended by workshop directly or do you have any advise ? I have checked internet and find the below solution. It does not say to change the parts as the workshop saying. Please advise. 

16555/P0171/000369

Contents

• 1 16555/P0171/000369 - Fuel Trim; Bank 1: System Too Lean
  • 1.1 Possible Causes
  • 1.2 Possible Solutions
  • 1.3 Special Notes

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

Special Notes

16825/P0441/001089

Contents

• 1 16825/P0441/001089 - EVAP Emission Control Sys: Incorrect Flow
  • 1.1 Possible Symptoms
  • 1.2 Possible Causes
  • 1.3 Possible Solutions
  • 1.4 Special Notes

16825/P0441/001089 - EVAP Emission Control Sys: Incorrect Flow

Possible Symptoms

• Malfunction Indicator Light (MIL) active

Possible Causes

• Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) faulty/jammed
• Evaporative Emission (EVAP) Canister Purge Solenoid Valve (N115) faulty/jammed
• Evaporative Emission (EVAP) Canister Sealing faulty
• Pipes between Tank Breathing and Throttle Body leaky/blocked

Possible Solutions

• Check Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80)
  • Perform Output Test
• Check Evaporative Emission (EVAP) Canister Purge Solenoid Valve (N115)
• Check Evaporative Emission (EVAP) Canister
• Perform Basic Setting
• Check Pipes between Tank Breathing and Throttle Body

Special Notes

• When found in the NAR 1.8T Audi A4 1.8T check TSB 24-08-78 or 2010268/3 or Pass-Thru equivalent TSB
• When found in the NAR 1.8T VW Passat 1.8T check TSB 01-09-09 or 2005554 or Pass-Thru equivalent TSB
  • Note: The Passat 26E5 or "R5" recall includes the same software update
• Make sure the quick release lines for the N80 valve and vacuum line to LDP are not crossed.
• This can also make the engine hard to start after filling up the fuel tank.