Skip the auto shop - Our mechanics make house calls

Q: Got a code of p0851 on 04 Forester xt. Shifter was stuck in park but I was able to jiggle it free. Today the oil light was flicking and stalling. Are these Related?

asked by on

Shifter stuck in p. Jiggled free but got code "po851.Park-Neutral Switch input circuit low" Next day nearly stalls and at oil light flickers. Can the neutral safety switch be cause of both? Does " circuit low" mean NSs needs replacing? Do u have to remove exhaust to get at nss? Thanks

My car has 136000 miles.
My car has an automatic transmission.

Hi there. The neutral safety switch (transmission position switch (sensor)) on the transmission and the engine oil light on the dash have nothing in common. If the neutral safety switch has failed, then the transmission may start in gear or in any position that the shifter is in. Also, the engine may not start at all, but the engine will not stall out due to the switch failing. The engine oil light flickering only means that there is a loose connection to the oil pressure sending unit on the engine or the sending unit is failing or the oil pump is loosing oil pressure. I recommend putting a mechanical oil pressure gauge on the engine and testing the oil pressure when the light is flickering. If the light is flickering and the oil pressure is high, then the sending unit has a problem. If the oil pressure is very low and the light is flickering, then the oil pump is failing or the oil filter is plugged up. When removing the neutral safety switch, it is not necessary to drop the exhaust down, but if you need the extra room, then you could drop the exhaust down. If you need further assistance with replacing the transmission position switch (sensor) and diagnosing the low oil pressure, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  • Home
  • Questions
  • Got a code of p0851 on 04 Forester xt. Shifter was stuck in park but I was able to jiggle it free. Today the oil light was flicking and stalling. Are these Related?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: CEL slow higher rpms

Hello there, thank you for asking about your 2013 BMW 135i. The very first thing I would do is have the vehicle scanned for trouble codes, as sputtering and a Check Engine Light can be caused by a wide variety...

Q: Car stalling, hesistating, and jerking.

This sounds like a fuel pump issue of low fuel pressure conditions or the fuel filter is clogged causing low flow. I recommend you have the system checked by a qualified mechanic.

Q: oil leak from oil filter housing.

Hi there. There is not much of an easier way to remove the housing. However, look at the situation and look to see what needs to be taken off and what does not need to be taken off. If oil...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.