Heya. I have a 2006 Toyota 4runner with 275k miles on the chassis and frame, and 171k on the engine, transmission, and drivetrain (2007 parts). My engine has the check engine light, VSC Off, VSC TRAC, and traction control light lit up like a Christmas tree on my dash. Also, at very low speeds and at low throttle, this sound from exhaust (I don't know if my cats are shot) is like a high-pitched rattling sound, NOT like a rock bouncing around on youtube videos you'd look up online about shot cats. My O2 sensors are all new and have been replaced WITH spacers on them. I took my car to the local automotive shop, they said to fix this they would need to mess with the exhaust, put new O2 sensors on and take the spacers off, then diagnose from there to see what's wrong. It's going to be expensive from them... I also am wanting to do this myself... I have a mechanic friend that told me that my cats need to be replaced but I'm not so sure it's the problem just yet... Any suggestions? Does anyone else have this problem? Pls help anything is greatly appreciated... (also my car runs and drives just fine, it just makes that really annoying sound and the lights on the dash...)
Why did the original engine need to be replaced? Are the cat/s still the original ones?
You forgot to mention the main thing: What are the codes on the dash?
Did you use OEM oxygen sensors?
Here's the thing it's a check engine light comes on on that vehicle it automatically will trigger those other codes so the code you have to fix generally unless you have more than one problem is the code that is tripping the check engine light. And if it is an oxygen sensors are catalytic converters other than guessing you really have to pay a guy like me with some very fancy scan equipment they analyze waveform on an oscilloscope and do some testing of the catalytic converters
