Question

I have a 2004 Volvo S60 2.5T and it is showing the code P2178. Do you have any possilbe solutions that may clear this code for me? Thank you for your time and help in regards to the matter.

Answer 1

Some tests need to be done to accurately diagnose the problem, but here are the probable causes of the problem:

• Intake air leaks 
• Faulty Front Heated Oxygen Sensor (HO2S) 
• Ignition misfiring 
• Faulty fuel injectors Incorrect fuel pressure 
• Faulty Mass Air Flow (MAF) sensor 
• Incorrect Positive Crankcase Ventilation (PCV) hose connection

P2178 Volvo Code - Long-Term Fuel Trim Lower Limit
Read more: https://www.autocodes.com/p2178_volvo.html