does the knock sensor have to be replace or could it be something else?
What is your question?
It started with my radiator fan burned out. Had it replaced along with the coolant temp. sensor. Brand new fan has stopped working . had the van put on machine and codes are P0325 knock sensor 1 circuit malfunction and P0440 which was gas cap. could it be something else or is that"s what causing the fan not to work. when driving it acts like the fuel filter could be clogged. not all the time though. also a little sluggish in changing gears and getting up speed. once it changes all gears it is ok. please help
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Hello,
The knock sensor issue will be separate (most likely) from the "gas cap" code.
The knock sensor may even just have a dirty or loose connection, or wiring may be faulty/left unplugged.
The fan should only run when the relay is on, so the last fan may have been fine. Check the fan by jumping (shorting) across the relay with a 10 gauge or larger wire.
If the fan comes on, you know the relay needs to be tested. It may be difficult, because it seems that the issue with the fan may be intermittent.
The "Gas Cap" code informs you that pressure in the EVAP system and fuel tank is being lost to some sort of leak.
This leak may be a crack, hole, or something missing, or it may be a bad purge valve (allowing the engine to suck air from the fuel tank at all times). This is the vacuum leak side of the issue that must be investigated.
