1998 Toyota Avalon oil light

ALONGAMORE17

MEMBER
1998 TOYOTA AVALON
6 CYL
2WD
AUTOMATIC
237,000 MILES

My cars oil light has come on. I had the oil pressure checked and it was fine then I had the oil changed. Then it went off. Then the other day us came on again and I has the sending unit replaced but the light is on and staying on. There is no ticking noices and I cant seem to find anyone who knows whats wrong. Could it be electrical?

3 Replies

IMPALASS

MECHANIC
3,112 POSTS

Hello

To better assist you please let me know if your model is a XL or XLS. Also your engine size in liter.

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Wednesday, February 18th, 2009 AT 2:09 PM

RASMATAZ

MECHANIC
75,992 POSTS

Light staying on constantly means low oil pressure

Possible causes include:

Excessive main and rod bearing clearances (someone may have installed the wrong-sized bearings or standard-sized bearings on a reground crankshaft). Only 0.001" of extra clearance in the main bearings can reduce oil pressure by up to 20%!

Excessive camshaft bearing clearances (a bearing may have slipped out of place when the cam was installed).

Excessive clearances inside the oil pump.

Leaks between the oil pump and engine.

Oil pump relief valve stuck open or installed backward.

A loose or mispositioned oil pickup tube (too high in the oil pan).

A defective oil pressure sending unit or oil pressure gauge.

Low oil level in the oil pan.

Cracks or leaks in the oil galleries or gallery plugs.

Cracked oil pump housing (improper installation).

Oil viscosity too thin for hot weather.

Oil viscosity too thick for cold weather.