Adi-Benz

Engine light came on today, went to autozone, 3 codes

P0128 coolant thermostat - coolant temperature below thermostat regulating temperature (x2)

P2568 Direct ozone reduction catalyst temperature sensor circuit range/performance


Now, I just want to know

What I need to buy
How much does it cost
What is the problem
Any other helpful info, diy, etc.



Any help is appreciated, I gtg for now, will be using other car.

Adi-Benz

Someone said they changed battery, some just cleared codes, some replaced thermostat, etc. I have no idea what to do.

Funkwagen bro how do I clear codes? (or anyone else for that matter)

>

Plutoe

P2568=https://www.yourmechanic.com/article/p2568-obd-ii-trouble-code-direct-o-zone-reduction-catalyst-temperature-sensor-circuit-range-performance-by-jay-safford

P0128=you need a new thermostat

Total cost of parts and labor=800 bucks

DIY=get off the couch and do a google search

Adi-Benz

yes I read it already, thanks, but p0128 they say replacing the thermostat is not always the case.

and I've done a google search. (not on mobile so not on couch anyway?)

Adi-Benz

People say thermo is issue but no issues with temperature?

CGSColin

The thermostat is designed to fail open so the car doesn't overheat. When the car is up to operating temperature and the thermostat is functioning it will stay at 95 celsius but if the thermostat has failed it will likely stay at around 80 celsius (depending on ambient temperature).

Adi-Benz

This exactly describes my situation, I thought since the temp was not higher it would not be the issue. Thank you a lot, will be receiving the part soon.

Any info on the other code?

CGSColin

A cursory search seems to indicate that the P2568 could be related to the failed thermostat as they're both coolant temperature related codes. If it were me I would replace the thermostat, clear the codes, and see if the P2568 comes back before trying to chase it down.

Adi-Benz

Yes, I found the same; btw, earlier I tried to clear the codes but the engine light kept up so didn't work. Guess I'll have to fix it first.

Adi-Benz

Is the car still driveable?

CGSColin

I don't see why not, at least in the short term. The thermostat is open so it won't overheat and the direct ozone reduction catalyst is an emissions thing.

Adi-Benz

Yeah I was just worried about the thermo.

I also have to drive every weekday on highway for ~40 min going and then coming.

Glad its an easy fix and something relatively common I guess.

CGSColin

It should be fine because it's open meaning coolant is constantly flowing through the engine; just keep an eye on your engine temperature.

My thermostat went a couple of years ago and I drove around fine for a week or two until I was able to get it fixed.

Colin G

Luckily mine was replaced right before I bought my car a short while back. It is a pricey repair at the dealership for just a thermostat.

Funkwagen

Sorry I took too long to answer, looks like it won't resolve the problem anyway. That being said, both codes look related to the thermostat - emissions won't be proper if the engine never reaches/doesn't stay within correct operating temperature because the thermostat has failed (and stuck open)

Josh.A.Hussey

Had same issues, thermostat. Mine was warranty though...

Adi-Benz

Just received the thermo, will hopefully get it done tomorrow. Will post update then.

Adi-Benz

Update: Installed thermostat, about 1 hour job, not too bad.

Now to see if the light will go off soon, or if I'll have to clear the codes.

Josh.A.Hussey

Good stuff! Glad you never ran into trouble, I am interested in the outcome.

Adi-Benz

After 2 days of driving, light is gone and codes are clear!

Yay!

CGSColin

Huzzah!

Prowla

My 2013 C300 just gave me that P2568 code, I recently had the radiator flushed and since then the fan has been going constantly it seems (and loud)
was the Fan a sign that something was wrong or about to be?
in the mean time Ill have a new Thermostat Unit installed.

C300_10

I just replaced my thermostat after receiving the P0128 code stating coolant temperature below threshold. Hopefully the code will clear soon.