Acura 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 the driver's side (left side). I've already tested the ignition coils, which are functioning properly. Spark plugs have been replaced with new Denso units sourced from Honda. The EGR valve has also been serviced. Despite these efforts, the vehicle is now consuming excessive fuel. I'm seeking advice on possible causes related to the P1304-P1306 codes and the P1399 fault, especially since only the left side cylinders are affected. Any insights into potential sensor issues or wiring problems would be greatly appreciated.
Pascal Bhamu wrote: My 1998 Acura 3.5L RL is showing multiple OBD2 fault codes: P1304, P1305, P1306, P0300, and P1399. The issue appears to be a lack of spark signal to cylinders 4, 5, and 6 on the driver's side (left side). I've already tested the ignition coils, which are functioning properly. Spark plugs have been replaced with new Denso units sourced from Honda. The EGR valve has also been serviced. Despite these efforts, the vehicle is now consuming excessive fuel. I'm seeking advice on possible causes related to the P1304-P1306 codes and the P1399 fault, especially since only the left side cylinders are affected. Any insights into potential sensor issues or wiring problems would be greatly appreciated.