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.
2005 Cadillac DeVille P0385 Fault: After Installing Two Crankshaft Sensors, Car Won't Start
I recently installed two crankshaft position sensors in my 2005 Cadillac DeVille. Since the replacement, I've started receiving fault code P0385, and the vehicle is now unable t...
2005 Cadillac DeVille | P03852003 Nissan Pathfinder P0171 Code: System Too Lean (Bank 1) - Diagnosis and Fixes
Hi everyone, I'm experiencing a P0171 diagnostic trouble code on my 2003 Nissan Pathfinder with an automatic transmission. The code indicates 'System Too Lean (Bank 1)', meaning...
2003 Nissan Pathfinder | P01712001 Chevy Blazer P0300 Random Multiple Cylinder Misfire Diagnosis and Repair
My 2001 Chevrolet Blazer previously had a P0410 code, which was repaired successfully. However, it has now developed a P0300 code indicating a random or multiple cylinder misfir...
2001 Chevy Blazer | P0300P0730 OBD2 Fault Code on Mercedes SLK R170: Transmission Stuck in First Gear
Hello, I'm experiencing a P0730 diagnostic trouble code on my Mercedes SLK R170. The vehicle's automatic transmission is stuck in first gear, making it difficult to drive. I'm w...
MERCEDES SLK R170 | P0730How to Fix OBD2 Code P0446 on a Chevrolet Vehicle
Looking for guidance on repairing OBD2 diagnostic code P0446 in a Chevrolet vehicle. This code typically relates to the evaporative emission control system and may indicate an i...
Chevy car | P04462005 Ford E350 5.4L V8 - P2270 Code with No Downstream O2 Sensor Found
I own a 2005 Ford E350 Super Duty box truck equipped with a 5.4L V8 engine. The vehicle is currently displaying a P2270 diagnostic trouble code, which indicates an issue with th...
2005 Ford E350 | P22701997 Nissan 200SX P0325 and P1400 Fault Diagnosis: Knock Sensor & Circuit Issues
I own a 1997 Nissan 200SX (Series 2.0L). After retrieving fault codes P0325 and P1400, I replaced the knock sensor solenoid and the three associated hoses—particularly the botto...
1997 Nissan 200sx | P03252000 Silverado P0157 and hard starting
I have a PO157 o2 sensor circuit low voltage code and the vehicle is not starting every time. Sometimes it takes several attempts to get the vehicle started. I looked over the n...
2000 Silverado | P0157P0303 Misfire Diagnosis and Repair for 2010 Chrysler Town & Country SE
I own a 2010 Chrysler Town & Country SE with a 3.3L engine. The vehicle is showing a P0303 misfire code. I have already replaced all spark plugs, ignition wires, the coil pack, ...
2010 Caravan | P03032005 Jeep Liberty 3.7L Engine P0204 Code: Cylinder 4 Not Firing, No Ground Signal from PCM
I'm experiencing a P0204 diagnostic trouble code on my 2005 Jeep Liberty with the 3.7L engine. Cylinder #4 is not firing despite good compression, new spark plugs, and I've swap...
2005 Jeep Liberty 3.7 | P21771998 Chevrolet Pickup P0202 Fault: How to Fix Cylinder 2 Fuel Injector Issue
I own a 1998 Chevrolet pickup with 198,600 miles. The engine is misfiring and has triggered a diagnostic code P0202 — indicating a fuel injection system fault in cylinder 2. I'm...
1998 chevrolet pickup | P02022004 Audi S4 P0300 Misfire & Lean Fuel Trim Codes: Coil, Injector or Electrical Fault?
I own a 2004 Audi S4 (V8, 4.2L) with 94,000 miles and am experiencing sudden, severe misfire issues accompanied by a blinking check engine light. I drove approximately 2 miles h...
2004 Audi S4 | P21772012 Cadillac SRX P0014 and P0017 Fault - 85K Miles, MIL On, Power Reduction
I have a 2012 Cadillac SRX with a 3.6L engine, currently showing P0014 and P0017 diagnostic trouble codes. The codes appear intermittently over the past nine months, and recentl...
2012 Cadillac SRX | P0014Nissan 350Z P0507 Fault: Idle Speed Control System RPM Higher Than Expected
The OBD2 diagnostic code P0507 in a Nissan 350Z indicates that the idle speed control system is detecting an RPM higher than expected. This fault typically points to issues with...
nissan 350z | P05072008 Ford Focus P0138 OBD2 Diagnostic Code Explanation
I am experiencing a P0138 diagnostic code on my 2008 Ford Focus. The code indicates an issue with the oxygen sensor heater circuit, specifically related to the front oxygen sens...
2008 ford focus | P01382010 GMC Equinox P0114 Code: Intake Air Temperature Sensor Issue - Solenoid Replacement & Diagnosis Tips
My 2010 Chevrolet Equinox is throwing a P0114 diagnostic trouble code, which according to GM Tech Tool indicates an intermittent intake air temperature (IAT) sensor circuit faul...
2010 Equinox | P0114U0129 Fault Code: Lost Communication with Brake System Control Module - Toyota Land Cruiser 200 (VDJ200L-GNTNZV)
I own a Toyota Land Cruiser 200 (model VDJ200L-GNTNZV) and am currently experiencing the U0129 diagnostic trouble code, which indicates 'Lost Communication with Brake System Con...
TOYOTA LANDCRUISER | U01292009 Chevy HHR P0304 Misfire: Intermittent Traction Control, Black Soot on Intake Ports, and Fuel Type Impact
My 2009 Chevrolet HHR LT with a 2.4L engine and automatic transmission has been experiencing intermittent check engine light (CEL) activation and now displays 'Service Traction ...
2009 Chevy HHR | P03042004 Chevrolet Tahoe P0200/P0300/P0308 Misfire Fix: Wiring or PCM Issue?
I recently purchased a 2004 Chevrolet Z71 Tahoe with 90,000 miles. The vehicle was about 200 miles away from my home, so I drove it directly to my residence without any issues a...
2004 Chevrolet Tahoe | P03002001 Ram 1500 5.2L Engine Codes P0442 and P0455 - Evap System Leak After Smoke Test
My 2001 Ram 1500 with a 5.2L engine is showing diagnostic trouble codes P0442 and P0455. A smoke test identified an evaporative emissions system leak. I performed multiple evap ...
01 Ram 1500 5.2L | P0442Practical 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.