Michael Hayes

Fuel Trims Explained: STFT and LTFT Guide

Fuel trims explained: learn STFT, LTFT, positive and negative trims, normal ranges, lean/rich patterns, MAF clues, and scanner diagnosis.

OBD2 Mode 6 explained: learn onboard monitor test data, misfire clues, catalyst tests, readiness, live data differences, and scanner limits.

P0302 means cylinder 2 misfire detected. Learn symptoms, causes, coil and spark plug checks, injector tests, compression checks, and fixes.

P0301 means cylinder 1 misfire detected. Learn symptoms, causes, coil and spark plug checks, injector tests, compression checks, and fixes.

P0174 means System Too Lean Bank 2. Learn symptoms, causes, fuel trim checks, MAF data, vacuum leaks, diagnosis steps, and fixes.

P0101 means mass airflow sensor range/performance problem. Learn symptoms, intake leak checks, MAF data, fuel trims, diagnosis, and fixes.

P0442 means EVAP system small leak. Learn gas cap checks, small leak causes, scanner data, smoke test steps, diagnosis, and fixes.

P0135 means Bank 1 Sensor 1 oxygen sensor heater circuit fault. Learn symptoms, causes, fuse checks, wiring tests, diagnosis, and fixes.

P0011 means camshaft timing is over-advanced or not responding correctly. Learn oil checks, VVT causes, scanner data, diagnosis, and fixes.

P0455 means EVAP system large leak. Learn gas cap checks, EVAP leak causes, scanner data, smoke test steps, and safe repair order.