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.
1999 Ford E-250 V8 5.4L P0300 & P0307 Misfire: Cold Start Good, Hot Start Skips After Shutdown
I own a 1999 Ford E-25
99 E-250 V8 | P03001997 Grand Prix OBDII Error Codes PO300 and PO420: Catalytic Efficiency Below Threshold Issue
I own a 1997 Grand Prix and am currently experiencing persistent OBDII error codes PO300 and PO420. I was able to clear other codes, including those related to the evaporative s...
1997 GRAND PRIX | P0300P1128 Error Code on 2000 Volkswagen Passat: Causes and Fixes for Rough Idle and Hesitation
Hi everyone, I recently encountered a P1128 diagnostic error code on my 2000 Volkswagen Passat. The car is exhibiting symptoms such as rough idle, surging at stoplights, and he...
2000 Passat | P1128P0171, P0174, and P0304 Faults in 2000 Lincoln LS V6: Causes and Fixes
I own a 2000 Lincoln LS with a V6 engine that has been running roughly for some time, and the service engine light has remained on. After retrieving diagnostic codes, I found P0...
Lincoln LS V6 | P0171Lexus ES300 P0135 Fault: How to Locate and Replace Oxygen Sensor Bank 1 Sensor 1
I own a 1998 Lexus ES300 and my check engine light has come on. After being scanned by a backyard mechanic, the diagnostic code returned is P0135 — Oxygen Sensor Bank 1 Sensor 1...
Lexus ES300 | P01352001 Pontiac Sunfire P1336 Error Code: What Does It Mean and How to Fix It?
Hi everyone, I'm Kristin — a female car owner with no mechanical background, so please don't mock me for asking basic questions. I bought my 2001 Pontiac Sunfire from Carmax a...
2001 Pontiac Sunfire | P13361998 Chevrolet Tracker P1400 Error: EGR Flow Fault Diagnosis and Symptoms
My wife's 1998 Chevrolet Tracker is displaying a P1400 diagnostic trouble code, indicating an EGR flow error. I'm trying to understand how the EGR system determines whether it's...
1998 chevrolet tracker | P1400P0101 Fault Code on 1996 GMC Yukon 5.7L Vortec Blower System - Diagnosis and Fix
Hello everyone, I'm currently troubleshooting a P0101 malfunction indicator code on my 1996 GMC Yukon with the 5.7L Vortec engine equipped with a V-2 trim blower system for tow...
5.7L GMC | P0101P0601 Fault on 2002 Chrysler PT Cruiser: Causes and Repair Options
The Powertrain Control Module (PCM) has detected an internal memory error in its rewriteable RAM section. This P0601 code indicates a failure within the PCM's memory, which is c...
02 PT Cruiser | P0601P0402 Fault Code on 2000 Chrysler Town & Country 3.8L: EGR System Diagnosis and DPFE Sensor Inquiry
At approximately 99,000 miles, the Check Engine Light (CEL) activated and displayed fault code P0402. I replaced the EGR valve, after which the CEL turned off for a few driving ...
2000 Chrysler Town and Country 3.8L | P0402Practical 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.