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.
1997 Mercury Mountaineer 5.0L V8 P0303 Misfire: Exhaust Manifold Leak and Injector Diagnosis
I own a 1997 Mercury Mountaineer with a 5.0-liter V8 engine that is running rough and has triggered a diagnostic code P0303 — indicating a misfire in cylinder 3. Upon inspection...
97 Mercury Mountaineer | P03031999 Ford Ranger P0352 DTC: Ignition Coil B Primary/Secondary Circuit Fault - Which Coil Is 'B'?
I own a 1999 Ford Ranger with the 2.5L 4-cylinder engine and recently received a Check Engine Light diagnosis showing DTC P0352: "Ignition Coil B Primary/Secondary Circuit Malfu...
99 Ford Ranger | P0352P1580 Fault Code in Volkswagen Jetta: Throttle Actuator Malfunction and Low Idle Issues
The P1580 fault code in a Volkswagen Jetta (2000–2001 1.8L, 1996–2001 2.0L or 2.8L models) indicates a Throttle Actuator (B1) malfunction, often accompanied by symptoms such as ...
jetta | P1580C0000 and P0701 Diagnostic Codes on 1998 Neon 2.0 SOHC Automatic: Causes and Fixes
I recently purchased a 1998 Neon 2.0L SOHC with an automatic transmission, which was towed home due to a failed head gasket—a known issue in early model Neons. The check engine ...
98 Neon 2.0 SOHC | C00002001 Mitsubishi Vehicle Fault Code P1225: Diagnosis and Solutions
I recently encountered fault code P1225 on my 2001 Mitsubishi vehicle. I need detailed information about what this error means, how it is diagnosed, and potential fixes. The cod...
2001 mitsubishi | P12251999 Ford Taurus P1309 Code: Misfire Detected with Ignition Monitor Disabled - How to Diagnose and Fix
I recently replaced both the camshaft position sensor and crankshaft position sensor on my 1999 Ford Taurus, but the P1309 code persists even after clearing the engine control m...
99 Taurus | P130999 Dodge Neon RT P0171 Code: Causes, Fixes & DIY Solutions for Fuel Lean (Bank 1)
I'm experiencing a recurring P0171 code on my 1999 Dodge Neon RT with approximately 70,000 miles. The car has a manual transmission and a 2.0L DOHC engine. This diagnostic troub...
99 dodge neon rt | P0171P0420 Catalyst Efficiency Code with Sluggish Acceleration in 2002 Monte Carlo 3.4L
I own a 2002 Chevrolet Monte Carlo with a 3.4L V6 engine. The vehicle exhibits sluggish acceleration, particularly around 2200 RPM, where it bogs down. When I apply more throttl...
2002 Monte Carlo | P04201997 Toyota Taurus SHO OBD2 Code P1121: TPS Inconsistent with Mass Airflow Sensor - Diagnosis and Fixes
I own a 1997 Taurus SHO that is currently throwing diagnostic code P1121, indicating an inconsistency between the Throttle Position Sensor (TPS) and the Mass Airflow Sensor (MAF...
97 Sho | P1121PO304 Misfire on Cylinder 4 - 98 Tahoe Injector Swap Fix & Diagnosis
I recently encountered a persistent PO304 misfire code on my 1998 Chevrolet Tahoe after replacing the injectors. Initially, I was told by a mechanic that a bad injector was caus...
Unknown | P03001997 Ford Ranger 41K Miles, P0171 Code: Bank 1 Lean Mix - Diagnosis & Fixes
I own a 1997 Ford Ranger with approximately 41,000 miles. I'm currently receiving a diagnostic code P0171 (Bank 1 Fuel Trim Lean), and no other related codes are present. I've a...
97 Ford Ranger | P01712002 Ford Mustang P0411 Code: Causes and Fixes for Secondary Air Injection System
I've been informed that the P0411 diagnostic trouble code indicates an issue with either the secondary air injection valve or its control module. Does anyone have hands-on exper...
2002 Mustang | P04112000 GMC Sierra 5.3L Engine P0157, P0172, P0175, P0330 Fault - Oil Consumption & Knock Sensor Issue
My 2000 GMC Sierra with a 5.3L V8 engine has developed several diagnostic trouble codes after being mudded extensively a few months ago. Since then, the vehicle exhibits inconsi...
2000 GMC | P01571996 Ford Escort Won't Start with P0190 and P0193 Fuel Rail Issues - Is It the Pressure Regulator?
My 1996 Ford Escort won't start and has triggered fault codes P0190 and P0193, which I believe point to a fuel rail problem. I suspect the fuel pressure regulator is at fault, b...
1996 Ford Escort | P0190Practical 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.