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2000 Acura TL P0301, P0300, P0705, P0706, P1740 - Multiple Fault Codes After Spark Plug and Coil Replacement

Model: 2000 Acura TL Fault Code: P0301 Posted: 2014-03-28 15:29

I own a 2000 Acura TL and am currently experiencing multiple OBD2 fault codes: P1740, P0302, P0301, P0706, P0705, and P0300. I recently replaced the spark plugs and attempted to diagnose a potential coil pack issue by swapping Coil 1 and Coil 2. After this, the car ran smoothly for several weeks before the codes returned. Despite the intermittent nature of the symptoms, the engine light remains on. I'm seeking advice on possible root causes. Are these valid fault codes or could they be intermittent? What should I check first—such as ground connections under the hood, valve cover gasket issues, or transmission-related sensors? Any insights would be greatly appreciated.

Related fault codes

P0301P0705P0706P1740

Comments (4)

Anonymous 2014-03-29 07:47

With multiple fault codes appearing simultaneously, it's important to first verify whether they are valid or intermittent. Start by clearing the ECU memory and performing a test drive under normal conditions. If the codes return, prioritize checking the highest-priority codes—such as P0705 and P1740—since these can indicate serious transmission issues. Also inspect all ground connections, especially those beneath the hood. Acura vehicles have been known to generate false or intermittent codes after valve cover gasket replacement due to poor grounding. If you find that the issue persists, consider a full ECU reset and retesting.

Anonymous 2014-12-12 17:00

I have an Acura TL 2000 with similar symptoms—P1740, P0302, P0301, P0705, and P0706. I replaced spark plugs and cleaned the valve cover gasket, which helped initially. After resetting the system, only P0302 remained. Replaced the ignition coil for cylinder 3, and the engine ran smoothly—just as it did when I bought it—with no smoke or odor. However, about 20 miles later, the check engine light and TCS warning light activated. The new codes were P0705 (Transmission Range Sensor Circuit Malfunction) and P0131 (O2 Sensor Low Voltage). I didn’t reset the system after diagnosis, and now both codes are gone—still not showing after one day of driving. I’ve been researching transmission range sensors and will share a resource when I locate one. This experience may help others facing similar issues.

Anonymous 2014-12-24 13:48

The ignition coil (ignitor) should be inspected as a potential cause, especially if misfire codes like P0301 or P0302 persist after spark plug replacement. A failing igniter can mimic multiple cylinder misfires and may require testing with a multimeter to confirm continuity and signal output.

Anonymous 2014-12-26 10:11

I have a 2000 Honda Accord with codes P1739 (3rd gear pressure circuit), along with cylinder misfire codes P0305, P0301, P0303, and P0304. These appeared suddenly after the car ran normally for days. Now it feels like a rock tumbler and emits a rich fuel smell. Before replacing all six ignition coils, I’m wondering if there’s another underlying cause—such as a timing issue? It's unusual that four out of six coils failed simultaneously on a 78k-mile vehicle with only 14 years of use. Could this be related to a mechanical or sensor fault rather than coil failure? Any thoughts would be helpful.