Traditional gasoline car fault

1999 Ford Escort Engine Won't Start: Fixing P1506, P0171, and P0420 Codes

I own a 1999 Ford Escort with a non-original 4-cylinder engine that has recently stopped running. After retrieving the trouble codes using an OBD-II scanner, I found three key e...

99 Ford Escort | P0171

P0171 and P0174 Fault Codes on 1998 Mazda B4000 - Engine Hesitation and Rough Idle

I took my 1998 Mazda B4000 to a garage, where they replaced the mass airflow sensor and fuel filter. Despite these repairs, the vehicle continues to show P0171 and P0174 diagnos...

98 mazda b4000 | P0171

1997 Ford Ranger P0171 P0301 P0304 - Misfire at Idle and Low RPM, Spark Check Confirmed

My 1997 Ford Ranger is exhibiting a misfire issue that worsens during gear shifts when engine RPMs drop. The truck runs smoothly on the highway but misses significantly at idle....

1997 ford ranger | P0171

Mazda 626 1999 - Persistent P0421 and P0171 Codes After EGR Cleaning and Vacuum Leak Repair

Hi everyone, I own a 1999 Mazda 626 and recently encountered the OBD2 diagnostic code P0171 (Rich Fuel Mix - Bank 1). I took it to Sears Auto Shop, where they performed several...

Mazda 626 | P0171

2001 Toyota Corolla (CA model) P0171: Fixing Hesitation and Emissions Failure with MAF Sensor and Air Intake Diagnosis

This is my first post on the forum, but I've relied heavily on these discussions for troubleshooting. My girlfriend recently moved to Phoenix from California with her 2001 Toyot...

2001 Toyota Corolla (CA model) | P0171

P0171 Fault Diagnosis and Repair Guide for 2000 Ford Escort ZX-2

I recently received a P0171 diagnostic code on my wife's 2000 Ford Escort ZX-2. The vehicle has been running smoothly until now, but yesterday it began stalling three separate t...

2000 Ford Escort ZX-2 | P0171

2000 Dodge Durango P0171 P0551 P0455 P1195 Fault: Poor Fuel Economy, Black Smoke, Exhaust Soot - How to Fix?

I own a 2000 Dodge Durango with a 4.7L V8 engine. The vehicle runs smoothly under normal conditions, but it consumes fuel rapidly—averaging only 7 to 8 miles per gallon. When th...

2000 Durango | P0171

P0171 and P0174 Fault Codes on 1999 Ford F-150 4.2L Engine - Diagnosis and Fixes

I'm experiencing persistent P0171 and P0174 diagnostic trouble codes on my 1999 Ford F-150 with a 4.2L engine. I've already replaced the Mass Air Flow (MAF) sensor, but the code...

Ford F150 | P0171

1997 Mercury Cougar 4.6L V8 P0171 & P0174 Code: Diagnosis and Fixes After Intake Manifold Replacement

I own a 1997 Mercury Cougar with the 4.6L V8 engine, currently at approximately 134,000 miles. I've been experiencing persistent OBD2 diagnostic trouble codes P0171 (System Too ...

1997 Mercury Cougar | P0171

PO171 & PO174 Diagnostic - 2001 Ford E250 5.4L Engine Issues

We have thoroughly inspected and repaired the engine of our 2001 Ford E250 with a 5.4L V8 engine, including replacing the PCM, MAP sensor, fuel pump, intake gaskets, IAC valve, ...

2001 E250 | P0171

2000 Olds Bravada P0171 and P0174 Codes: Fuel Pump or MAF Sensor Issue? Car Won't Start

I own a 2000 Olds Bravada. Today, the check engine light came on, and I've been diagnosed with trouble codes P0171 and P0-than-174. Later that day, my car would not start at all...

olds bravada | P0171

P0171 Fuel Bank 1 Lean Only - 1996 Mercury Cougar 6-Cylinder Diagnosis

I own a 1996 Mercury Cougar with a 6-cylinder engine, and my check engine light is currently on. The diagnostic trouble code (DTC) displayed is P0171, indicating a lean conditio...

96 mercury cougar | P0171

2001 Pontiac Grand Prix GT - Fault Codes P0171 and P0741: Causes and Fixes After Engine & Transmission Rebuild

My 2001 Pontiac Grand Prix GT has 140,000 miles on the odometer. The engine and transmission were recently rebuilt approximately 865 miles ago. I'm now seeing two diagnostic tro...

2001 pontiac Grand prix GT | P0171

1999 Jeep Wrangler 4-Cylinder with P0171 O2 Sensor Code - Troubleshooting Guide

Hi, I own a 1999 Jeep Wrangler 4-cylinder and am currently experiencing a P0171 diagnostic trouble code. I've already replaced the oxygen sensor, checked all vacuum lines, and v...

1999 jeep wrangler | P0171

P0171, P0300, P0306 Faults in 1997 Pontiac Grand Prix GTP with Supercharger: Symptoms After 15-Minute Drive Cycle

After purchasing the 1997 Pontiac Grand Prix GTP, I began experiencing recurring engine issues while driving home. The vehicle exhibits symptoms including loss of power, knockin...

97 Pontiac Grand Prix GTP | P0171

2002 Ford Windstar P0171 and P0174 Diagnosis: Lean Mixtures, Vacuum Leak, MAF Sensor Issues

I've completed the TSB for intake gasket replacement, but it's not resolving my issue. I'm now completely stuck trying to diagnose this. When driving, the engine produces a whin...

2002 ford windstar | P0171