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.
2000 Honda CR-V P1399 and P0304 Fault Diagnosis: Sensor Behind Cylinder 4 Near Manifold
I've identified the root cause of my P1399 and P0304 diagnostic codes on my 2000 Honda CR-V. The issue is a sensor or wiring harness located behind the engine, near cylinders 4 ...
2000 Honda CR-V | P03042003 Acura TL Misfire Codes P0300-P0305 and P1399: Fuel Pump or Engine Issue?
While driving, my 2003 Acura TL began sputtering and the check engine light started flashing. The onboard diagnostic system shows multiple misfire codes: P0300 (random/multiple ...
Acura TL | P03002004 Honda Odyssey P0301 P0304 P0306 P0300 P1399 - Misfire Codes and Check Engine Light Issues
I own a 2004 Honda Odyssey and recently experienced a serious issue. Two days ago, while driving on the highway, the check engine light and TCS warning light came on simultaneou...
2004 Honda Odyssey | P03011999 Honda Civic P1399 Ignition Fault Code: Diagnosis and Repair Guide
A customer recently brought in their 1999 Honda Civic with multiple engine issues. After performing a full tune-up—including spark plug and wire replacement—and replacing the ox...
1999 Honda Civic | P13992000 Honda Civic LX Repeated P1399 and P0304 Codes - Diagnosis and Solutions
I own a 2000 Honda Civic LX and am experiencing recurring fault codes P1399 and P0304. I've already replaced the spark plugs, ignition coil, rotor, cap, wires, and performed val...
2000 Honda Civic | P03042001 MDX Check Engine & VTM4 Lights On: P0305 and P1399 Codes Explained
My 2001 Mazda MX-5 (MDX) with 195,000 miles is running smoothly overall, but the Check Engine and VTM4 warning lights intermittently illuminate. The only diagnostic codes retrie...
Unknown | P0305Honda Civic 2000 LX Misfire Codes P1399, P0300-P0304: Causes and What to Check
I own a 2000 Honda Civic LX with 114,000 miles. The check engine light came on immediately after filling the tank with gas. I had previously added a bottle of Redline fuel injec...
Honda Civic 2000 LX | P0300Acura 3.5L RL 1998 | P1304, P1305, P1306, P0300, P1399 - No Signal to Cylinders 4, 5, 6 on Driver's Side
My 1998 Acura 3.5L RL is showing multiple OBD2 fault codes: P1304, P1305, P1306, P030-0, and P1399. The issue appears to be a lack of spark signal to cylinders 4, 5, and 6 on th...
Acura 3.5 RL | P0300Honda Civic VTi Engine Fault Codes P1399 and P0325 - Loss of Acceleration and Stalling
I recently replaced the engine in my Honda Civic VTi, but now the vehicle experiences a significant loss of acceleration and stalls unexpectedly. The engine runs smoothly at idl...
honda civic v tec | P032599 Honda Odyssey P0304 & P0305 Misfire with P1399 Code: How to Diagnose and Fix Using Coil Drop Test
When experiencing misfire codes like P0304, P0305, or the generic P1399 on a 1999 Honda Odyssey, follow this proven diagnostic sequence from cheapest to most expensive: 1. Perf...
99 Honda Odyssey | P03042000 Honda Accord V6 P1399 Code: Diagnosis & Missing at High Speeds Below 2000 RPM
I own a 2000 Honda Accord V6 EX Coupe with 168,000 miles. The car ran smoothly for two months (approximately 2,000 miles) before developing a recurring issue. Recently, I've not...
2000 Accord V6 | P13991999 Honda Accord EX Misfire Diagnosis: P0300-P0304 and P1399 Codes Explained
I've reviewed numerous posts on this topic and tried various troubleshooting steps, but the issue persists. Vehicle: 1999 Honda Accord EX (standard model), 125,000 miles, regul...
99 Accord | P0300P1399 Fault Code on 2000 Honda Prelude - Solutions After EGR Valve Replacement and Cleaning
Hi, I own a 2000 Honda Prelude and am currently experiencing a P1399 diagnostic trouble code. I've already replaced the EGR valve and cleaned carbon buildup from the EGR valve a...
honda prelude | P13992000 Honda Accord V6 OBD Codes P0420 and P1399: Cat Failure or Misfire? Diagnosis & Solutions
I own a 2000 Honda Accord V6 with only 68,000 miles on the odometer. Recently, I've been receiving two OBD-II diagnostic codes: P0420 and P13909. Initially, the vehicle showed a...
2000 Honda Accord v-6 | P04201997 Acura EL with P1399 and P1300 Error Codes - Need Help Diagnosing Misfire Issues
I'm looking for help diagnosing my 1997 Acura EL, which is running poorly and has triggered error codes P1399 and P1300. These codes indicate a multiple cylinder misfire, which ...
1997 Acura EL | P130099 Honda Odyssey P0304, P0305, P1399
Door rates at a dealer often tend to be higher but again there are exceptions to the rule! I've seen independants higher then dealers and often they work on a two or three leve...
99 Honda Odyssey | P03041997 Honda Civic P0302/P0303/P0304 and P1300/P1399 Misfire: Ignition System Diagnosis & Repair Options
Hello everyone, I own a 1997 Honda Civic with 61,000 miles. Recently, after completing a comprehensive 60,000-mile maintenance service, the Check Engine Light (CEL) came on. I ...
97 Civic | P03022000-2003 Acura TL 3.2L V6 Fault Codes P1607, P1298, P0141, P1399 - Diagnosis and Fixes
I own a sandrail built with the 2000-2003 Acura TL 3.2L V6 engine. I'm consistently seeing these OBD-II diagnostic codes: P1607, P129,
2000-2003 Acura | P0141Honda Civic 98 OBD P1399 P0335 P0301 P0300 - Stalls at 3000 RPM, Poor Idle, Fuel Pump Failure Suspected
I own a 1998 Honda Civic 1.8L automatic model that suddenly starts jumping at 3000 RPM and fails to accelerate beyond that point. The engine barely idles, which raises concerns ...
honda civic 98 | P030099 Honda Odyssey P0304, P0305, P1399
Hello. I have a 1999 Honda Odyssey that overnight developed a problem. When I started the car to check (my wives car so she told of the problem) I noticed right off it was mis...
99 Honda Odyssey | 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.