2004 Honda Odyssey Random Misfire Codes P0300-P0306 and Voltage Faults (Bosch OBD Scanner)

Model: 2004 Odyssey Fault Code: P2177 Posted: 2016-06-09 20:28

I own a 2004 Honda Odyssey with 212,000 miles. Using a Bosch OBD-II scanner, I've detected the following fault codes: - P0300: Random Misfire - P0301 to P0306: Misfires in cylinders 1 through 6 - 61-01: Battery Voltage Malfunction - 34-02: Throttle Position Reference Voltage Malfunction - 31-02: PFINH Signal Malfunction I've already replaced the throttle position sensor and followed all calibration instructions. After clearing the codes, the issue returned immediately. I'm now considering replacing the spark plugs (last serviced around 50K miles ago). Question: Does anyone with a 2004 Odyssey experience similar misfire codes or voltage-related issues? Are there any known diagnostic steps or common causes for PFINH signal malfunction? After trying spark plug replacement, I may have to consult a dealership. Coil replacements cost $54 each (6 total), which adds up quickly. Any advice would be greatly appreciated! Thanks in advance!