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.
P0420 Code on Toyota Avensis 1.8 Petrol 2003: Fuel Efficiency Drop and Catalytic Converter Issues
Hi everyone, approximately one month ago, the engine management light came on in my 2003 Toyota Avensis 1.8 petrol (VVTi, new shape). After taking it to a local garage, they dia...
Toyota Avensis 1.8 petrol 2003 | P0420P0401 Fault on 2005 Ford Freestar 4.2L: DPFE and EGR Combined in One Unit
I'm a DIY enthusiast who relies heavily on online resources to troubleshoot car issues myself. My 2005 Ford Freestar with a 4.2L engine recently triggered a P040-1 diagnostic tr...
2005 Freestar | P0401P0171 Code on 2001 VW New Beetle Turbo: Causes and Solutions
Hello everyone, This is my first post on the forum. I'm currently experiencing a P0171 diagnostic trouble code (DTC) — 'System Too Lean Bank 1' — on my 2001 VW New Beetle Turbo...
2001 VW New Beetle turbo | P017103 trailblazer p0300 code low on power runs rough
I have an 03 trail blazer with 150,000 miles that is running rough and low on power. It was running fine until my wife brought it home after filling with gas. I read the codes a...
03 Trailblazer | P0300P0420 Fault in 1998 Honda Accord 2.3L 4-Cylinder: Is the Catalytic Converter Really the Problem?
Does a P0420 code mean my catalytic converter (cat) is faulty? My 1998 Honda Accord 2.3L 4-cylinder has 125,000 miles. The secondary oxygen sensor was replaced at 115,000 miles ...
1998 Honda Accord 2.3- 4 cy | P04201999 Oldsmobile Silhouette P0341 Error Code: What It Means and How to Fix It
I'm getting a P0341 diagnostic trouble code on my 1999 Oldsmobile Silhouette. Can anyone explain what this error means and provide basic information about how to fix it? Is the ...
1999 Oldsmobile Silhouette | P03411997 Ford Thunderbird 4.6L P0171 Code: Intermittent Lean Running at Idle
I've already replaced the upstream oxygen sensors with new ones. I cleaned the MAF sensor wires using electrical cleaner, as they appeared clean initially. The spark plugs are b...
1997 4.6 Thunderbird | P01711997 Ford Taurus P0133: Oxygen Sensor Slow Response, Bank 1 Lean/Rich Codes Explained
Hello everyone, Here are the key details of my vehicle: - Year: 1997 - Make: Ford - Model: Taurus - Engine Size: 3.0L (VIN "U") - Mileage: 107,000 miles - Transmission: Automat...
1997 Ford Taurus | P01331997 Subaru Legacy Outback P0507 Code After Head Gasket Repair
I own a 1997 Subaru Legacy Outback with a 2.5L engine and over 134,000 miles. The vehicle was experiencing overheating, which we diagnosed as a head gasket failure. After replac...
Subaru | P0507P1170 Fault Code on 2003 BMW 540i: Diagnosis and Solutions
I'm having difficulty finding reliable information about fault code P1170 specifically for my 2003 BMW 540i. The 'Service Engine Soon' light is currently illuminated, and I've a...
2003 BMW 540i | P11701999 Ford Ranger XLT 3.0L V6 4x4 OBD2 Code P0149 - Fuel Timing Issue Diagnosis
I own a 1999 Ford Ranger XLT with a 3.0L V6 engine, automatic transmission, and 4x4 drive. I recently received an OBD2 diagnostic code P0149 indicating a fuel timing issue. I'm ...
99 ranger | P21772002 Ford Windstar P0171-P0174: Causes and Fixes After Air Filter Replacement
I recently replaced the air filter on my 2002 Ford Windstar in November. About 2–3 weeks later, the check engine light came on with codes P0171 and P0174. I inspected the air fi...
Ford Windstar | P01712003 Ford Explorer 4.0L Transmission P0755 Code: Slow Shifting and O/D Light Flashing
I'm experiencing slow transmission shifting and a flashing Overdrive (O/D) light on my 2003 Ford Explorer with the 4.0L V6 engine. The check engine light came on, so I had it sc...
2003 Ford Explorer | P07552002 Chevy Venture P0442 EVAP Leak: How to Diagnose Without Removing the Gas Tank
The Service Engine Soon light has been on continuously for several weeks on my 2002 Chevy Venture. My local mechanic confirmed an EVAP system leak during inspection, but when us...
2002 Chevy Venture | P04422000 Ford Focus P0171 and P0734: Fixing Lean Code with Budget-Friendly Repairs
My fiancée's 2000 Ford Focus (SOHC, automatic transmission) has been running with a persistent P0171 code (lean condition in Bank 1) and previously had a P0734 code related to t...
2000 Ford Focus | P0171P0158 and P0160 OBD2 Codes on 1999 Infiniti QX4: Causes and Solutions After Timing Belt Service
My 1999 Infiniti QX4 with a 3.3L 6-cylinder engine and 4-wheel drive has failed an emissions test due to OBD2 diagnostic codes P0158 and P0160. The inspection station initially ...
1999 Infiniti QX4 | P0158PO171 and PO174 Diagnosis for 1999 Ford F150: Lean Mixtures in Both Banks
The vehicle is displaying diagnostic trouble codes PO171 and PO174, indicating a lean air-fuel mixture in both engine banks. I took it to a repair shop where they replaced the f...
1999 Ford F150 | P0171BMW 335i P1146 故障码解析：如何理解并解决此发动机故障代码
Hello everyone, I'm currently encountering fault code P1146 on my BMW 335i and would appreciate any clear explanation of what this code means and how to address it. Can anyone p...
BMW 335 | P11461996 Ford Ranger 4.0 V6 Dies at Idle: P0040, C0880, and Multiple O2 Sensor Codes Explained
Vehicle: 1996 Ford Ranger, 4.0L V6, manual transmission, 211,000 miles My 1996 Ford Ranger has been experiencing intermittent engine stalling, especially when cold and during i...
Ranger | C0880Practical 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.