Traditional gasoline car fault
Search fault code and browse forum case posts.
This page is designed for quick diagnosis on gasoline vehicles by combining code lookup with real discussion cases. Enter a fault code to filter related topics, then compare symptom context such as cold start behavior, acceleration load, fuel-trim deviation, ignition misfire pattern, and recent maintenance history. Many codes can be triggered by shared root causes, so use cross-checks from multiple posts before replacing sensors, coils, injectors, or catalytic components.
P0304 Fault in 2005 Dodge Neon SXT - Misfire Diagnosis and Solutions
My 2005 Dodge Neon SXT is displaying a P0304 cylinder 4 misfire code. I've already replaced the spark plugs, ignition wires, and the ignition coil. The engine idles roughly, and...
2005 Dodge Neon SXT | P030498 Ford Tarus 3.0L Engine Faults: P0174, P1131, P1151 - Diagnosis and Solutions
I've been troubleshooting a persistent engine issue on my 1998 Ford Tarus 3.0L engine. After installing a code reader, I'm now seeing fault codes P0174, P1131, and P1151. The sy...
98 Tarus 3.0 eng | P017402 pontiac grand am with p0305 code
Yesterday my car was running horrible so I took it to the shop and finnally figuered that it was the FPR so I had it changed. Now the car is running like a champ. thanks everyone!
Pontiac Grand Am | P03051996 Ford Thunderbird PO720 Error Code - Speed Circuit Malfunction Diagnosis
My 1996 Ford Thunderbird with a 4.6L V8 engine is displaying a PO720 error code, indicating a speed circuit malfunction. The speedometer has stopped working, and the overdrive l...
1996 ford thunder | P07201999 Ford F-150 V6 4.2L: Fixing OBD-II Codes 0171, 0174, 0401, and 1408 with Shaking at Idle
My son owns a 1999 Ford F-150 V6 4.2L 2WD with 112,000 miles. Recently, the truck began shaking severely at idle and low speeds—similar to being about to stall—but does not actu...
1999 Ford F-150 | P01712000 Toyota Celica P0505 Code: How to Fix Engine Light Fluctuations and IAC Valve Issues
My 2000 Toyota Celica has a recurring engine light that turns on and off. The diagnostic code is P0500, which indicates an issue with the idle air control (IAC) system. I've alr...
2000 Toyota Celica | P0505What Does 'PD' Mean in P0128 PD? Understanding Pending vs. Hard Codes for 2002 Chevrolet Xtreme
Hi everyone, I've been researching code P0128 and have gathered some additional information to share — thanks to all who contributed! Recently, my 2002 Chevrolet Xtreme has trig...
PO128PD | P01281996 Jeep Cherokee P0132 Code: Running Rough and Service Engine Light On
Hi, My daughter called this morning and reported that her 1996 Jeep Cherokee was running very roughly, with the service engine light illuminated. I checked the vehicle and confi...
1996 Jeep Cherokee | P01322001 Honda CR-V 4-Cylinder - Fixing P1457 Evaporative Emissions Code
Good morning! I'm researching how to fix the P1457 diagnostic code on my 2001 Honda CR-V with a 4-cylinder engine. The vehicle is showing P1457 (Evaporative Emission System Leak...
2001 honda crv | P14571996 Mercury Cougar 4.6L V8 P0155, P0156, P0161 O2 Sensor Codes and Erratic Idle Diagnosis
Hello, I own a 1996 Mercury Cougar with a 4.6L V8 engine. Recently, I've been experiencing recurring check engine light issues triggered by codes P0155, P0156, and P0161 — all r...
mercury cougar | P0155P0401 EGR Flow Insufficient and Loud Clanking in 2000 Ford Ranger V6 3.0L: Carbon Buildup or Rod Bearing?
I own a 2000 Ford Ranger XLT with a 3.0L V6 flex-fuel engine (manual transmission). For four to five days, I was experiencing check engine light triggered by code P0401 — 'EGR F...
2000 Ford Ranger V6 3.0L | P04011995 Ford F-150 4.9L Engine P0133, P0153, P0171, P0174 Codes: Causes and Fixes with Crankcase Leak Diagnosis
My sister owns a 1995 Ford F-150 4.9L V8 engine with a 5-speed transmission. Maintenance has been consistently neglected, and the check engine light has remained on for over thr...
1995 Ford 4.9L F-150 | P0133P0420 OBD2 Code on 2001 Nissan Primera: How to Diagnose and Fix Without Replacing Both Catalytic Converters?
I own a 2001 Nissan Primera and have been experiencing a persistent Check Engine Light. A diagnostic scan revealed the OBD2 fault code P0420 - Catalyst System Efficiency Below T...
Nissan Primera | P04202001 Mitsubishi Eclipse Spyder GT P0301 Misfire: Causes, Fixes & DIY Diagnosis
I own a 2001 Mitsubishi Eclipse Spyder GT with a 3.0L V6 engine and over 10,300 miles. About a week ago, I switched from regular to premium fuel, and two days later my car began...
2001 Mitsubishi Eclipse Spyder GT | P03012003 VW Passat P0421 and P0431 Diagnostic: Causes and Intake System Issues
My 2003 Volkswagen Passat is displaying both P0421 and P0431 diagnostic trouble codes. Could these codes be related to a mass air flow (MAF) sensor malfunction or other intake s...
2003 VW Passat | P0421Subaru Forester 2003 P0030 and P003-30P Fault Code Explanation and Fix
We own a 2003 Subaru Forester with a 2.5L engine, automatic transmission, and currently at 105,000 kilometers with no modifications. The vehicle has shown reduced performance, e...
Subaru Forester | P00301999 Nissan Altima P-1491 Fault: Vacuum Cut Bypass Valve Location and Repair Guide
Hi everyone, I'm new to this forum and hoping for some advice. My 1999 Nissan Altima has recently started displaying the P-1491 diagnostic code, which my scanner identifies as r...
1999 Nissan Altima | P1491Practical workflow for fault-code troubleshooting
Start by confirming battery voltage and reading freeze-frame data, then inspect wiring and connectors before replacing parts. If the code returns after clearing, record the exact driving or idling condition when it reappears. Prefer case threads with complete repair feedback, because confirmed outcomes provide stronger guidance than one-time symptom descriptions. Following a step-by-step workflow reduces repeated repairs and lowers total diagnosis time.