Fuel System Diagnostics P0170, the Diagnostic Odyssey

Explore the P0170 OBD-II code for fuel trim issues: learn common triggers like vacuum leaks and MAF sensor faults, along with diagnostic tips at RepairPal. Comments Section ... The first step in diagnosing this is a contribution test to see if there's an issue affecting a single cylinder or if it's ... It reads like the engine is overfuelling, how old is the car ? it's recommended to replace the oxygen (lambda) sensors every ten years or so. First thing to check for is vacuum leaks posted MAF. P0170 indicates a lean condition with unmeasured air. Second would be fuel. Possible causes for fault code P0101 = ECM130A Air leakage to induction system, Dirty throttle body, Blocked crankcase ventilation or PCV nipple, Faulty MAF. Evo General - Code No. P0170: Abnormal Fuel System - hello, well as the title says, i have a check light on my evo 7 saying abnormal fuel ... I have this code. I changed the MAF sensor because the EGR valve is working and spraying carb cleaner around the intake gasket had no effect. Long term fuel trim is down to 14.8 now, which seems to fix the CEL, but it's idling like poop now. Sputters a lot. Codes P0170 through P0175 are caused by either unmetered air entering the engine or excess fuel entering the combustion chamber, though it could ... P0170 - Fuel Trim (Bank 1) - OBD2 Trouble code: ✓ Meaning ✓ Causes ✓ Symptoms ✓ Diagnostics ✓ Repair guides ✓ Repair costs ➤ Keep your car healthy.