Question about Subaru Legacy
My car has started vibrating a little when idling at a red light with foot on brake. It also sometimes has difficulty accelerating although this happens less often. The CEL codes indicated a number of different issues but I'm not sure if there is maybe one thing that could be causing all of this? For example, a knock sensor may be causing a variety of these issues... is that possible? I saw in another post by Mike Gagnon that O2 sensors and knock sensors slow various responses therefore causing rev issues. Could that relate to my situation as well? Thank you.
Posted by Anonymous on
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Posted on Jan 02, 2017
Engine vibration is the cause of this issue, it is the biggest complaint from many owners, changing the engine mounts will help, as mounts age the rubber gets hard and they don't absorb vibration like they should, new mounts help issue, but it will no stop it altogether. A faulty MAF will not cause vibration, just a hesitation on acceleration at times
Posted on Oct 07, 2008
The P0420 code is a Catalytic converter efficiency code check the compression.Swap the #1 injector to a different location to see if the code follows.Test the coilpak. A cracked exhaust manifold is the most likely cause p0171 and 0174 Induction air leaks, vacuum or some kind fuel restriction, weak fuel pump, restricted fuel filter etc.You also could have an exhaust leak near the upstream o2 sensor. If youtake it in they will probably use smoke to find out where the leak is.
Posted on Apr 22, 2009
is this a 4 or 6 cylinder?
if a 4 cylinder it will only have 2 o2 sensors
V6 will have 4 o2 senors which the sensor will be the right side of the engine first sensor.
1st sensor on exhaust, I recommend if you change one change all, as this will make the computer when it rechecks the system you have all clean/fast responding sensors.
if you have a slow response it means the sensor is dirty and not reading well, which is usually caused by minor misfires that the engine computer dismisses, so a tune up would be recommended too.
Posted on May 06, 2009
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