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.
P0136 Fault Diagnosis for 1999 Mustang (Non-GT) - Oxygen Sensor or Fuel System Issue?
Hi everyone, I recently ran diagnostics on my 1999 Mustang (non-GT model) and received a P0136 fault code. The car has accumulated 180,000 miles, and I'm unsure whether to inve...
1999 Mustang | P01361999 Toyota Camry P0401, P0505, and P0446: Are These Codes Related? Dealer Repair Coverage?
Hello, My son recently purchased a 1999 Toyota Camry. During the test drive, the check engine light came on. The dealer scanned the vehicle and reported codes P0401 and P0505. ...
99 Toyota Camry | P0401P0300 97 Subrban 350....
did a tune up, car ran fine for a month, now has a miss and P0300 code.. cylinder #2 has many missfires according to my scanner, thought it was an injector, so I replaced it, st...
97 Subrban 350 | P0300PO118 Fault Code on 2000 Jeep Grand Cherokee: ECT Sensor Issue and Cooling Fan Not Operating
I own a 2000 Jeep Grand Cherokee that has triggered a PO118 diagnostic code. I measured the voltage at the Engine Coolant Temperature (ECT) sensor and obtained a reading of 5V, ...
2000 Jeep Grand Cherokee | P01182004 Dodge Durango P0068 Code: Symptoms, Causes, and Fixes
My 2004 Dodge Durango has been exhibiting unusual driving behavior for some time. It shifts harshly and sometimes fails to move after stopping at a stop sign—requiring several s...
2004 Durango | P00682003 Dodge Durango 5.9L - PO455, PO138, PO442 Codes Fixed at 93K Miles | EVAP System Repair Guide
Hi everyone, This forum has been incredibly helpful to me—special thanks to Jeff Compton for his detailed and patient guidance. I’m sharing my experience here so that new garag...
2003 Durango | P01382005 dodge caravan p0340
I have a 2005 dodge caravan with a 2.4lt 4 cylnder motor, throwing out code p0340. It has 112000 miles. I have done all tune ups except i havnt touched timing belt. How can i de...
2005 dodge caravan | P03402007 BMW 525i P0030 O2 Sensor Bank 1 Sensor 1 Heater Circuit Malfunction - Fix & Diagnosis
Hello everyone, I'm seeking help with a recurring issue on my 2007 BMW 525i, which is no longer under warranty. Approximately two weeks ago, after the car had sat unused for ab...
2007 BMW 525i | P00302004 Chevrolet Trailblazer P0606 Code: PCM Processor Fault - What Does It Mean?
The check engine light has activated on my 2004 Chevrolet Trailblazer, and I've been diagnosed with a P0606 code. The vehicle runs smoothly under normal conditions, so I'm wonde...
2004 chevrolet trailblazer | P06062001 Jeep Grand Cherokee Laredo P1491 Code: Cooling Fan Relay Circuit Issue - Diagnosis and Fix
I recently replaced the cooling fan relay and subsequently the fan motor during a repair. Despite no overheating symptoms, my OBD-II scanner continues to display a P1491 code, w...
2001 Jeep Grand Cherokee Laredo | P14912003 Nissan Sentra P0335 Code: Check Engine Light On After Crankshaft Sensor Replacement
The 'Check Engine' light has been continuously coming on in my 2003 Nissan Sentra SE-R Spec V with the 2.5L QR25DE 4-cylinder engine. Every time I scan the system, I'm getting t...
2003 Nissan Sentra | P03352002 Jeep Liberty 3.7L V6 P0302, P0201, P0203, P0205 - Rough Idle, Hard Start, and Misfire Diagnosis
Hi everyone, I'm having a serious issue with my 2002 Jeep Liberty 3.7L V6 engine (145,000 miles). It was running fine until recently when it started running rough, especially un...
2002 Jeep Liberty | P02012000 Dodge Stratus 2.5L - P0340 Code: Camshaft Position Sensor Malfunction After Replacement
I own a 2000 Dodge Stratus 2.5L and recently experienced a complete engine failure while driving on the highway. The vehicle would not restart after shutting off. A diagnostic s...
2000 dodge stratus 2.5 | P03401999 Nissan Quest P1705 and P0325 Fault: Throttle Position Sensor and Knock Sensor Issues
I'm experiencing both P1705 (Throttle Position Sensor Circuit) and P032-5 (Knock Sensor Bank 1 Circuit) codes simultaneously on my 1999 Nissan Quest. The vehicle runs fine under...
1999 Nissan Quest | P03251999 Ford E150 Van P0302 Misfire: Is a Loose Fuel Cap the Cause?
I'm experiencing an intermittent P0302 code indicating a misfire in cylinder #2 on my 1999 Ford E150 van. The engine light flashes, then stays on, and I notice occasional hesita...
1999 Ford E150 van | P0302Practical 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.