SOURCE: 2003 Honda Oddyssey - PO325 Knock Sensor
If The engine in your van is a 3.5L, the knock sensor is under the upper intake manifold. This has to be removed in order to access the sensor on top of the engine block. The job requires an upper intake gasket set and about 1.5 hours to do; if you are handy with tools. For those who aren't; better off leaving this one to the professionals.
SOURCE: honda civic code p1399
I had the same issue and the same code along with the misfire codes too. I replaced the spark plugs and I have had great success. Change the plugs, wires, and maybe the distributor cap :)
SOURCE: what is check engine light on my hinda oddyssey
It means the computer has found a problem. Sometimes it is just an error and if you disconnect the battery for five minutes then reconnect the battery it will reset. If after driving the vechicle for about 50-100 miles the "check engine" light illuminates again go to your local auto parts store and ask them to check it. Most of them will check it at no charge and tell you what the code is & what it means. Autozone stores are one that always does this for free.
SOURCE: 2000 honda crv p1399 and p0301 check engine codes
Code P1399 is specific to Honda - it is an error code for "multiple variable misfires detected". P0301-P0304 are common OBDC codes for all cars, specifically "misfire in cylinder X".
You will get the P0301-P0304 codes on your OBDC reader when you plug it in (if actually errors), but will only find the P1399 if you select Honda as the manufacturer.
Just got these errors today on my CRV 2000. Now I have to figure out what is causing two of the cylinders to misfire.
SOURCE: 1997 accord dtc p1399,p0303
the po303 is cylinder 3 misfire and other code could be trans code or abs or body code i know yhe one for sure
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