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.
Ford Ranger 4.0L Trouble Codes P0125, P0171, P0303, P0304 - Diagnosis & Solutions
I have a 2000 Ford Ranger 4.0L V6 with persistent trouble codes: P0125, P0171, P0303, and P0304. I've already replaced the O2 sensor (addressing P0171) and cleaned the MAF senso...
ford ranger 4.0L | P01252001 Toyota Tundra 3.4L Extra Cab 4x4 P0440 EVAP System Fault - Solenoid Replacement & Diagnosis
Hello, I recently diagnosed a P0440 code on my 2001 Toyota Tundra 3.4L extra cab 4x4. I replaced one faulty solenoid in the EVAP system, and there are no visible leaks. I've als...
2001 Toyota Tachoma | P04401995 Mustang 6Cyl PO1020 OBD2 Code: Recurring Fault After New TPS Installation
1995 Ford Mustang 6-cylinder, OBD2 fault code PO1020. Vehicle last serviced in January/February 2024 at 189,000 miles. A new Throttle Position Sensor (TPS) was installed by the ...
1995 mustang | P10202001 Ford Escape V6 3.0L P0171 and P0174 Code: Rough Idle and Stalling Diagnosis
I own a 2001 Ford Escape with a 3.0-liter V6 engine that is experiencing rough idling and occasional stalling. The vehicle seems to be underperforming despite having already cle...
Ford Escape | P01712000 Nissan Quest P0325 Knock Sensor Fault Code: Causes and Diagnostics
Symptoms: After the engine warms up, the vehicle stalls when stopped and experiences misfires while driving. The issue does not occur when the car is cold. I recently had an aut...
2000 Nissan Quest | P03252000 Ford Focus P0171 and P0734 Fault: How a Stuck PCV Valve Fixed Both Codes
The OBD-II fault code P0171 in a 2000 Ford Focus can sometimes be caused by a faulty PCV (Positive Crankcase Ventilation) valve. After researching this issue, I inspected the PC...
2000 Ford Focus | P0171P304 Diagnostic Code for 2005 Chevrolet Colorado: Misfire and Check Engine Light
I'm experiencing a P304 diagnostic code on my 2005 Chevrolet Colorado, which has triggered the check engine light and intermittent misfires. I've already replaced the oxygen sen...
2005 Colorado | P20052005 Chevrolet Silverado OBD2 Codes 0171, 0131, 0300, 1133: Lean Bank 1, O2 Sensor Issues, Misfire Diagnosis
Hello everyone, My 2005 Chevrolet Silverado has a check engine light activated with the following OBD2 diagnostic codes: - 0171: System too lean (Bank 1) - 0131: O2 sensor circ...
05 Silverado | P01312001 Chevy Cavalier P0440 EVAP Fault: How to Fix Harness, Gas Cap, and Cracked Filler Neck
ratpower396 wrote: Can someone please help me locate the EVAP harness on my 2001 Chevy Cavalier so I can inspect it? Thank you. The EVAP harness is typically located under the ...
2001 Chevy Cavalier | P04402003 Pontiac Grand Am P0401 Fault: EGR Flow Insufficient - Fix After Valve Replacement
My 2003 Pontiac Grand Am with a 3.4L engine and 103,000 miles has been displaying trouble code P0400 Exhaust Gas Recirculation (EGR) - insufficient flow detected. I recently rep...
2003 Pontiac Grand Am | P04011997 Honda Passport P1392 G-Sensor Code: What It Is and How to Fix It
I own a 1997 Honda Passport with a 3.2-liter V6 engine, and my vehicle is currently displaying a P13992 diagnostic trouble code, which according to Honda's official service docu...
Honda Passport | P139296 Chevrolet Beretta 4-Cylinder P0301 Diagnostic: Causes and Solutions
What could be causing a P0301 fault code on my 1996 Chevrolet Beretta with a 4-cylinder engine? I've already replaced the spark plugs and ignition wires, so those aren't the iss...
96 Chevy Beretta | P030199 cobra.....P0420 code
Hi I purchased a 99 mustang cobra three months ago. The car only has 35k miles on it. The "service engine soon" light came on a couple of weeks after i purchased it. I cancelled...
99 cobra | P04201999 GMC Suburban P0300 Code: Rough Idle After Intake Manifold Replacement
Hello, I'm having trouble with my 1999 GMC Suburban that's showing a P0300 random misfire code. I've already replaced the spark plugs, ignition coil, cap, and rotor, but the eng...
99 Suburban | P03002001 Saturn P0410 Code: Secondary Air Injection System Failure Fix with VSV Replacement
http://www.obd-codes.com/p0410 After some research, I discovered that the P0410 code on a 2001 Saturn Solara indicates a malfunction in the secondary air injection system. This...
Saturn | P04101998 Pontiac Grand Prix P0706 Code: Transmission Range Sensor Issues and Engine Stalling Symptoms
The check engine light has not illuminated, but the vehicle exhibits severe driving irregularities—sometimes running smoothly, other times suddenly stalling. This occurs both wh...
1998 Pontiac Grand Prix | P0706Practical 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.