Yesterday my check engine light came on my 2002 Chrysler, oil level is good but i noticed the coolant is rust colored. Could that be the cause of the check engine light? Will a flush clear the light?

check your oil level, color, and smell. My guess is that the low oil pressure light is on because of literal lack of oil to pressurize. Generally when you get that light and a knock it points to major engine repair or replacing the engine. Knocks due to oil pressure can indicate many things from a bad head gasket to a stretched rod or blown piston rings. Check your coolant reservoir for signs of oil entering the cooling system as it will float on top of the coolant. By the sound of it it needs major mechanical repairs

Check you oil level. Is there oil on the ground?
What color is the oil?
Check coolant level and color.

Oil in the coolant caused by blown head gasket or cracked head. This will also cause overheating. :o(

First thing to do is look under the car were it is setting to see if there is a puddle of oil or transaxle fluid. Oil will be brown and the transaxle fluid will be a deep red color. With the car setting on level ground check the oil and transaxle fluid levels. ( you will need to have the car running to correctly check the fluid level in the transaxle). Once you have done this then you can tell what fluid level is low or none at all. If it is the transaxle level that is low then it could be a blown seal in transaxle causing the problem. (Rusted Sidepin ???) hope this will help you.

It sounds like you're having a few problems. The "oil in the coolant reservoir" issue could be due to a blown head gasket, which is a common issue on Dodge/Chrysler V6 engines. Also, because of damage to the radiator, there could be a coolant leak or you could have air in your cooling system. I would have that looked at and/or replaced after having the head gasket checked.

It may be your head gasket is bad. This would allow coolant into the combustion chamber and/or oil pan. A couple ways to determine this: check the oil level, if it is too high, you may be getting coolant in it, also, the oil on the dipstick or when drained has a 'milky' white-ish look to it. Check the exhaust after the car warms up, do you see white exhaust smoke? This also indicates the head gasket is bad.

There is a TSB for this problem. Here it is.

Bulletin No.: 04-06-02-007

Date: August 11, 2004

TECHNICAL

Subject:
Low Engine Coolant Level Indicator Always On (Diagnose Low Coolant Level System Operation/Check Sensor for Oil Contamination)

Models:
2000-2002 Buick Century, Regal
2000-2001 Chevrolet Lumina
2000-2002 Chevrolet Impala, Monte Carlo
2000-2002 Pontiac Grand Prix
2000-2002 Oldsmobile Intrigue

Condition

Some customers may comment that the low engine coolant level indicator is always illuminated.

Cause

The cause of this condition may be due to engine oil contaminating the coolant. Possible sources of oil contamination are internal engine leaks, improper service procedures, or the addition of some types of anti-leak additives to the cooling system. Once in the coolant, the oil leaves deposits on the level sensor creating an insulating film. This film results in a false activation of the coolant level indicator.

Correction

Diagnose low coolant level system operation and check the sensor for oil contamination using the procedure listed below.

Important: No coolant supplements should be used in GM cooling systems, other than what is approved and recommended by GM. The use of "aftermarket" over-the-counter sealing and cooling supplements may affect the operation of the low coolant level sensor. Discoloration of the coolant recovery bottle is normal and does not necessarily indicate that coolant contamination is present. Flush cooling system only when instructed by this bulletin.

1. Verify that the coolant is at proper level in the radiator and the coolant recovery bottle. If the coolant is low, add proper amount of 50/50 water and DEX-COOL(R) mixture. If the low coolant light operates properly, diagnose the cooling system for loss of coolant as outlined in SI. DO NOT proceed further with this bulletin.

2. Remove the low coolant level sensor. Refer to Coolant Level Module Replacement in the Engine Cooling sub-section.

3. With the key on, the engine off and the coolant level sensor disconnected from the vehicle wiring harness, observe the low coolant light:

^ Light is on - Chassis wiring or instrument cluster concern. Follow the appropriate diagnostic information in SI.

^ Light is out - Proceed to Step 4.

4. With the key off, connect the coolant level sensor into the vehicle's wiring harness. Connect a ground wire (1) to the battery negative terminal. Using a sharp probe (3) attached to the ground wire, ground the coolant sensor probe (2) as shown in the illustration. Make sure a good contact is made. With the key on and the engine off, observe the low coolant light for at least 15 seconds.

^ Light is on - Replace the low coolant sensor and re-check system operation.

^ Light is out - Proceed to Step 5.


5. Using a small wire brush or emery cloth, polish the low coolant level sensor probe to remove any film or oxidation. The probe should be a bright brass color when finished. Use Brake Parts Cleaner to flush removed deposits from the low coolant sensor probe. Re-install the low coolant sensor into the vehicle and proceed to Step 6.

6. Flush the cooling system and install new DEX-COOL(R) mixture as outlined in the SI. Check the vehicle's warranty history to determine if any engine gasket had recently been changed. If there has not been a recent gasket replacement, locate and repair the source of the engine oil contamination.

either a leaky head gasket or someone put oil in the overflow, it happens, clean it out drain the coolant from the entire system and refill with new long life antifreeze, also add a can of good radiator sealer.

Check the coolant level and thermostate. Also check if the water pump is running. Also check/replace the radiator cap (ask for recommended one). Also check the coolant color (ENGINE SHOULD BE NOT RUNNING AND COLD, NOT HOT). If you see it has rust pieces in it (not orange as the usual color of DexCool used for GM vehicles) you might need to do the radiator and/or cooling system flush.
Good Luck

Head gasket has failed allowing oil and coolant to mix together. Don't drive it until repaired,