97 Subaru Troublecode P0325 (Knock Sensor 1)-What to Do

Clear the code and see if it comes back immediately. If it doesn't, you may have had some bad gas or some carbon buildup in the cylinders or something. It is not uncommon to need to replace the knock sensor however. It MAY be worthwhile to use a bottle of Techron in the tank or do a Sea Foam treatment.

hard to say unless it is a 'hard' recurring failure.

(if AZ did not clear the code, try disconnecting the neg. batt. cable, step on the brake pedal, wait 20-30 minutes, reconn. batt. )

a GOOD independent mechanic can easily change a soobs knock sensor if it appears to be bad.

Carl

also - read this;

Carl

They did clear the code. Will see if it returns and act accordingly. TUVM.

Fairly common to have one fail. Easy to replace, but the part is kinda pricy. It's round, black, about 1 1/4 inch in diameter X 1 inch tall, retained by one 8mm (??? . . . 12mm head) bolt thru the center. Find it on top of the block, toward the back, just to the left (drivers side) and below the throttle body. '97s still had a wiring pigtail, I think; newer models have a connector right on the sensor. You'll probably have to push/pull/otherwise move assorted hoses and cables to get to it. To replace, find where the pigtail connects into the vehicle harness and unplug the old one (this can be the hardest part; try using a small screwdriver or ice pick to release the lock). Use a 12mm socket with appropriate extension to remove the bolt and lift everything out. Put the bolt thru the new sensor and carefully thread it back into the tapped hole. Tighten securely; 15-20ftlb I'd guess, re-route the wires, and plug it in.

ByeBye! S. Steve Jernigan KG0MB Laboratory Manager Microelectronics Research University of Colorado (719) 262-3101

Thanks for the detail. Interestingly enougt, the code was cleared and did not recur until, as iit was triggered last time I was in stop and go expressway traffic.

Jim

And this time it cleared itself overnight.

Hi Jim! I have replaced the knocksensor on both of my cars, 90 and 99 mod. Both came up with troublecode indicated knocksensor failure. After replacing and resetting OBD everything was back to normal. Read this for details:

according to Autozone > printout... "Troublecode OBDII (Alpha) P Code

The check engine light came on again, went off after an engine restart, came on again at another restart. Suggests that what the original Auto Zone guy and Subaru service guy told me might be wrong - corrosion or frayed wiring - could very well be the case. The Sooby Service guy said, I thought, it was down near the oil pan.

Will try and find it and take a look.