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.
P1128 Diagnostic Code for 2000 VW Jetta (2.0L) - What Does It Mean and How to Fix?
I'm looking for help identifying the cause of a P1128 diagnostic code on my 2000 Volkswagen Jetta with a 2.0L engine. The car exhibits rough idling, surges at stoplights, and he...
2000 VW Jetta | P1128PO442 Evaporative Emission System Small Leak - 1998 Chevrolet Malibu Diagnosis and Fix
I'm experiencing a recurring OBD2 fault code PO442 indicating a small leak in the evaporative emission system. After replacing the gas cap and clearing the code, the error retur...
Malibu | P04422001 Mitsubishi Galant OBD Codes P0421, P0141 (Duplicate) - Troubleshooting Guide
I'm currently troubleshooting a check engine light on my 2001 Mitsubishi Galant with a 6-cylinder engine. The vehicle is displaying OBD II diagnostic codes: P0421 (Catalyst Syst...
2001 Mitsubishi Galant | P0141Po301 code on 97 chrysler lhs
I get an intermitent misfire code for the number 1 cylinder (Po301) on my 97 lhs. It seems to only happen when its hot outside and comes on after I fill up with gas usually. T...
97 Chrysler LHS | P0301Thunderbird 1994 8Cyl OHC Misfire Diagnosis: PO306 Injector Grounding Issue
I have a 1994 Thunderbird with an 8-cylinder OHV engine. The vehicle is showing a diagnostic code PO306, indicating a misfire on cylinder 6. Upon investigation, I found that the...
Thunderbird | P0300P0455 and P0442 on 2001 Dodge Ram 4x4 Quad
After attaching my scan tool I retrieved the DTC P0455 and P0442 which point to both a large and small evap systems leak. Why would I have both instead of either one or the oth...
2001 Dodge Ram 4x4 Quad | P0442OBD Code P0401 and P0720 in 2001 Ford Taurus: Causes, Fixes, and DIY Replacement Guide
I own a 2001 Ford Taurus that is currently displaying OBD diagnostic codes P0400 (Exhaust Gas Recirculation Flow Insufficient) and P0720 (Speed Sensor Circuit Malfunction). The ...
2001 Ford Taurus | P0401P0133 Oxygen Sensor Fault on 1998 Ford Contour: DIY Repair Cost and Inspection Issues
My check engine light has been continuously coming on, and the diagnostic code displayed is P0133. This indicates a problem with the oxygen sensor. While I understand that this ...
1998 Ford Contour | P0133P0307 Code Repeatedly Appears in 1997 Dodge Ram 1500 5.2L - Misfire on Cylinder 7
I'm completely stuck with my 1997 Dodge Ram 1500 5.2L, which has reached 80,000 miles. The vehicle now repeatedly triggers the MIL (Malfunction Indicator Lamp) with a P0307 code...
Dodge Ram 1500 | P0307P1093 DTC Code on 2005 GMC 2500HD Diesel: Fuel Pressure Low, Engine Sputters Below 2000 RPM
I'm experiencing a P1093 diagnostic trouble code on my 2005 GMC 2500HD diesel truck. The engine sputters, runs roughly, and will not exceed 2000 RPM under load. This issue is li...
GM 2005 Diesel | P10931997 Ford F350 P0136 and P0141 Fault Codes: Oxygen Sensor Issues Explained
I'm currently troubleshooting a 1997 Ford F350 that has triggered fault codes P0136 and P0141. Could the catalytic converter be causing these issues? I'd appreciate any insights...
ford | P0136P0430 Catalyst System Efficiency Below Threshold - 1997 Mercury Mountaineer V8 AWD Diagnosis and Repair Options
I'm experiencing a P0430 OBD2 fault code on my 1997 Mercury Mountaineer with a V8 engine, automatic transmission, and all-wheel drive. The vehicle runs smoothly—no rough idle or...
1997 Mercury Mountaineer | P0430Subaru Legacy 2001 Fault Code P1590 Explanation and Fix Guide
Does anyone know what the meaning of Diagnostic Trouble Code (DTC) P1590 is for a 2001 Subaru Legacy? My mechanic has reset the code and claims it's resolved with no further act...
Subaru Legacy | P15901997 Sonata 2.0 Fuel Trim Malfunction (DTC P0170) - Diagnosis and Fixes
I own a 1997 Sonata base model with a 2.0L engine. About two weeks ago, I performed a tune-up using Bosch diagnostic equipment. Last week, my OBD-II scanner detected DTC P0170 —...
97 SONATA | P0170P0453 Diagnostic and Fix for 2003 Buick Rendezvous AWD with Versa Trac
The service engine light has come on in my 2003 Buick Rendezvous (AWD, Versa Trac model) with approximately 53,000 miles and a 3.4L engine. After checking the vehicle, I receive...
Buick Rendezvous | P0453Practical 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.