Not every warning light means a replacement. But these symptoms often point to serious internal damage.
Engine
- Knocking or rod knock that gets louder with RPM — often worn bearings.
- Blue or white smoke from the exhaust — burning oil or coolant.
- Low compression in one or more cylinders on a compression test.
- Metal in the oil when it's drained.
Transmission
- Slipping — the engine revs but the vehicle doesn't accelerate.
- Harsh or delayed shifts that fluid service doesn't fix.
- Burnt fluid or debris in the pan.
Repair or replace?
Get a diagnosis from a trusted mechanic. If the repair costs more than a used unit, replacing it with a tested used OEM engine or transmission is often the better value. Send us your VIN and we'll text you options and prices.