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 Mercedes C230 Kompressor P0170 Code: Negative Fuel Trim Values & Diagnosis Tips
Hello, I'm experiencing a persistent OBD2 fault code P0170 on my 1999 Mercedes-Benz C230 Kompressor, despite completing several common fixes. I've checked all vacuum hoses, rul...
1999 C230 Kompressor | P01702006 Chrysler Sebring Touring P0302
For the elaborated analysis of the question/situation: http://www.georgiarvinstitute.com/chrys ... ng2006.php Weird misfire at Cylinder 2 with heavy back/forth shaking at idle. ...
2006 Chrysler Sebring Touring | P03021999 Ford F150 V8 4.6L Misfiring: P0306, P0308 & Bank 2 Lean Code - How to Diagnose and Fix
Hi everyone, I'm looking for help with a persistent issue on my 1999 Ford F150 4.6L V8 engine. The vehicle has been in my possession for nearly a year, and recently it started t...
99 ford f150 | P0306P0340 Fault Causes Car to Stall After Warm-Up - 1999 Eclipse 2.4L
Hi, I recently purchased a 1999 Dodge Eclipse Spyder with 104,000 miles on the odometer. The vehicle is throwing a P0340 diagnostic trouble code (DTC), which indicates a camshaf...
Eclipse 2.4L | P03402012 Dodge Challenger P0300 Pending Code Reset & EGR Not Ready Issue: How Many Drive Cycles Required?
I own a 2012 Dodge Challenger with a 5.7L V8 engine and am experiencing an issue related to emissions system reset after addressing a misfire. Here are my two questions: 1) Wha...
2012 Dodge Challenger | P21772006 Buick Rendezvous P0420 Fault: Catalytic Converter Efficiency Below Threshold - O2 Sensor & Fuel System Diagnosis
I recently replaced both the catalytic converter and my pre- and post-cat oxygen sensors on my 2006 Buick Rendezvous V6 3.5L engine (approximately 151,000 km). Despite these rep...
BUICK RENDEZVOUS | P0420P0202 Fault Code in 2001 Jeep Cherokee Sport - Injector Circuit Open Cylinder 2
The P0202 diagnostic trouble code indicates a malfunction in the injector circuit for Cylinder 2, not Cylinder 5 as previously stated. The vehicle runs smoothly with no stalling...
2001 Jeep Cherokee Sport | P02022005 Ford Focus P0171 Too Lean: K&N Air Filter Causes and MAS Sensor Issues?
I purchased a 2005 Ford Focus ZXW in 2008 and have experienced no issues until last year, when I replaced the factory air filter box with a K&N cleanable air filter. Since then,...
2005 ford focus | P01712003 Ford F-150 V6 4.2L with P0171 and P0174 OBD2 Codes: Diagnosis and Repair Advice
I'm experiencing a persistent engine light on my 2003 Ford F-150 with a 4.2L V6 engine, showing diagnostic trouble codes P0171 and P0174. The previous mechanic replaced the airf...
2003 Ford F150 | P01712008 Ford F-150 XLT P0060 O2 Sensor Error: Engine Light On, Code Reappears After Replacement
My 2008 Ford F-150 XLT 4x4 has a steady engine light. After a diagnostic at Auto Zone, the code read P0060 — indicating a problem with the oxygen sensor #2 on the driver's side,...
2008 Ford F-150 XLT | P00602005 Ford F150 XLT 5.4L Triton Engine P2198 and Misfire Codes Diagnosis Guide
My 2005 Ford F150 XLT recently developed multiple engine fault codes after experiencing a severely rough idle and subsequent shutdown. The diagnostic trouble codes include: P002...
2005 Ford F150 XLT 5.4 Triton | P03002006 Ford Focus 1.8 TDCI - P0001 Code, Blue Smoke, Rough Idle, No Glow Plug Light
Over the past few days, my 2006 Ford Focus 1.8 TDCI has exhibited intermittent starting issues. When cold-starting, I notice blue smoke from the exhaust and a rough idle that la...
focus 1.8 tdci | P00012004 Dodge Ram 1500 P0448 Fault: Engine Stalls in Cold Weather, Won't Idle Until Warm-Up
My 2004 Dodge Ram 1500 is experiencing a recurring issue in cold weather: the engine only idles for a few minutes before stalling. Once it stalls, it will not restart on its own...
2004 dodge ram 1500 | P04482002 Saturn SL2 P0404 and P0405 Codes - How to Complete Drive Cycle for Smog Check
I'm currently going through the vehicle registration process in California, but during the mandatory smog check, my 2002 Saturn SL2 triggered two diagnostic trouble codes: P0404...
Saturn SL2 | P04042009 Mitsubishi Outlander P1590 and P1777 Fault Code: Engine Speed Change Issue at 95,000km
I own a 2009 Mitsubishi Outlander with a 2.4L AWCS engine, currently at 95,000 kilometers. Occasionally, the vehicle fails to change speed smoothly during driving. This issue is...
2009 Mitsubishi Outlander | P15902003 Passat 1.8 Engine Misfire - P0304 Code Explanation and Location of Cylinder 4
I recently received a diagnostic code P0304 indicating a misfire in cylinder 4 of my 2003 Volkswagen Passat 1.8L engine. I'm trying to understand where cylinder 4 is located and...
2003 Passau 1.8 | P0304Practical 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.