Paddington

no, its like the one between 0:17 - 0:19

well thats in my car. i wish i had the same pops as he did sadly i drive a c200

arnold0523

2015 C300 w/ sport pack has the pop sound.
2017 C300 loaner w/o sport pack didn't or very very minor pops..
This made the AMG Performance Exhaust on my C43 even worth the value. LOL

Trancebolt

Couldve been built in 2015 still just cause it was listed as a 16 year. Pre August or whatever maybe.

oxxy

I have experimented two car C250 (W205) and GLC 250 with regards to Voltages and Amps, as I have similar warning, its good that I have identical car where one have problem where you can compare the alternator or battery performance , here is the details. both car Manufacture 2066 but I bought 2017 for C250 and 2018 for GLC 250.

The C250(W205) had Stop/Leave engine running for +/- 2 weeks, however engine starting system is Ok, while GLC 250 does not have this message.

1. Preparation display Voltage & amps
a. Switch ignition position 1
b. Select display where trip top/ total trip bottom
c. Press phone (Call) then (within split seconds) OK (hold 5 secs)
d. then go to vehicle data /where it shows voltage (UB:12.4, IB -15A, TB: 40oC etc) this would be Battery Voltage, the charge rate (+ is charging – is discharge), then TB is Temp of battery.


2. GLC 250 Testing (from internal data)
When the ignition on, the display is UB:12.4, IB -15A, TB: 40oC
After I started the car, the Batt drop to 11.4 Volt UB, Amp drop t0 -200 Amp IB (split second), -30, -20 then after 10 seconds idle the volt reading 14.8Volts and charging rates 50-30 Amps. There is no message / NORMAL.



3. C250 (W205) (from internal data)
When the ignition on, the display is UB:12.3, IB -15A, TB: 37oC
After I started the car, the Batt drop to 10.6 Volt UB, Amp drop t0 -240 Amp (split second), -30, -20 then after 10 seconds idle the volt reading 14.8Volts and charging rates 50, 40,30,20 then goes to 18.8 Amps then the MESSAGE APPEAR.

So I replace with identical VARTA 71 Ah battery where the result is identical with GLC 250.

I was recommended to do computer reset by delaer but this does not requires computer reset and the memory remain ( I assume the backup battery is still good)

I hope this helpful.

I am not sure what is UB, IB & TB stands for, any one ?

you want to see the video (im not sure if this is OK, try to open youtu.be/eTFXjA2xufQ

lululu

Do an engine compression test , whatever cylinder is low, then do a leak down test, if leakdown is excessive over 30% leakage you likely have a broken piston