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 Nissan Maxima P0138 and P0325 Fault: Which Sensor to Replace First?
I own a 1999 Nissan Maxima with the Check Engine Light illuminated. My OBD2 scanner is showing both P0138 (Rear Oxygen Sensor Malfunction) and P0325 (Knock Sensor Failure). I'm ...
1999 Nissan Maxima | P0138P0171 and P0174 Fault Codes on 1998 Mazda B4000 - Engine Hesitation and Rough Idle
I took my 1998 Mazda B4000 to a garage, where they replaced the mass airflow sensor and fuel filter. Despite these repairs, the vehicle continues to show P0171 and P0174 diagnos...
98 mazda b4000 | P0171OBD2 Code P0402 on 2000 Ford Taurus: How to Diagnose EGR vs. DPFE Sensor
The OBD2 diagnostic code P0402 is triggered by the engine control module, indicating a potential issue with the Exhaust Gas Recirculation (EGR) system or the Diesel Particulate ...
2000 Taurus | P04022001 BMW 325xi P0365 Code: CMP Sensor Issue After Head Replacement
Hi, I own a repair shop and am currently troubleshooting a recurring P0365 code on a 2001 BMW 325xi. We recently replaced the cylinder head, and for about three weeks, no diagno...
2001 BMW | P0365P0715 Fault Code in 1997 Ford Taurus: Causes and Solutions
I recently encountered a P0715 diagnostic trouble code on my 1997 Ford Taurus. The code indicates an issue with the turbine shaft speed sensor (TSS) circuit. This sensor is loca...
1997 Taurus | P07152000 Dodge Dakota Check Engine Codes 185 and 45-5: Truck Dies Suddenly, Low MPG, Water Light Flashes
My 2000 Dodge Dakota is showing persistent fault codes 185 and 455. Although the check engine light is not illuminated, my truck frequently dies unexpectedly. The water temperat...
2000 dodge dakota | P1855How to Remove Upstream O2 Sensor on 2002 Ford Mustang Without Dropping the X-Pipe | P1132 Fault Code
I'm looking for a reliable method to remove the upstream oxygen sensor on my 2002 Ford Mustang without having to drop the x-pipe from the exhaust manifold. The vehicle is showin...
2002 Ford Mustang | P11321999 Ford Van 4.6L Engine Misses on Cylinders 1 and 7 After 10 Seconds of Running
I have a 1999 Ford van with a 4.6L engine that runs smoothly for the first 10 seconds after starting, but then begins to miss on cylinders 1 and 7. I've already replaced all spa...
ford 4.6 | P03002006 Ford F150 Misfire Codes P0302 and P0304: Diagnosis and Solutions
Hi aeroman, My 2006 Ford F150 has been experiencing intermittent misfires, indicated by diagnostic codes P0302 and P0304. The engine only dies once—when idling—and runs very ro...
2006 FORD F150 | P03021996 Chevy 1500 P1406, P0101, P0102 Diagnostic Update: EGR and MAF Issues
Thank you to everyone who responded to my earlier post. I've taken several steps to troubleshoot the persistent issues on my 1996 Chevy 1500: - I blew air into the EGR ports, w...
1996 Chevy 1500 | P01012002 Nissan Xterra P0138 Error: Bank 1 Sensor 2 Secondary HO2S Circuit High Voltage Issue
Hello, I'm experiencing a 'Service Engine Soon' error code P0138 on my 2002 Nissan Xterra. This code relates to the secondary oxygen sensor (HO2S) circuit in Bank 1 Sensor 2. Ca...
2002 NISSAN XTERRA | P01382004 Ford F150 5.4L V8 Fault Codes P2106, P2006, P1000, P0645, P0443 Explained - DIY Repair Guide
I own a 2004 Ford F150 4x4 SuperCrew Lariat with a 5.4L V8 engine. I've been encountering multiple diagnostic trouble codes (DTCs) and am unsure whether these represent isolated...
2004 F150 | P04432001 Ford Focus 1.6 UK - P0172 Fault Code: Rich Running, MAF & Lambda Sensor Diagnosis
Hi everyone, I'm based in the UK and driving a 2001 Ford Focus with a 1.6L engine. This forum is US-focused, but I hope this information still helps. I recently picked up an O...
2001 Ford Focus 1.6 | P01722001 Monte Carlo P0128 Fault: Temperature Gauge Reads 0, Fan Runs Constantly
My temperature gauge consistently reads 0, and the engine cooling fans activate. The OBD2 code displayed is P0128. I've confirmed that there are 5 volts of power reaching the EC...
Monte Carlo | P01282004 Jeep Grand Cherokee P0205 Code: Injector Circuit Open in Cylinder 5
My 2004 Jeep Grand Cherokee with a 4.0L engine and 30,000 miles has started running rough. The check engine light came on, and I've been reading codes: P0205, P0300, P0305, and ...
jeep grand cherokee | P02052005 Chevrolet Cobalt P0463 OBD2 Code: Fuel Level Sensor Issue or Wear?
My daughter recently purchased a 2005 Chevrolet Cobalt with the 2.2L engine. Upon inspection, I noticed that the vehicle is a previously rebuilt unit—visible repairs were eviden...
2005 chevy Cobalt | P0463P0340 Check Engine Code on 1998 Chevrolet Malibu 3.1L: Causes, Fixes, and Fuel Economy Impact
My 1998 Chevrolet Malibu with a 3.1L engine and 110,000 kilometers has been experiencing the check engine light coming on nearly every day for over a year. After a recent tune-u...
1998 Malibu | P0340Practical 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.