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eautosales, ASE MECHANIC
Category: Mercedes
Satisfied Customers: 16011
Experience:  ase certified
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It overheated while my wife was idling, and the ":Check

Customer Question

it overheated while my wife was idling, and the ":Check engine electronics" error message came on. Also the Check Engine light came on.
JA: Does the light stay on, or does it blink?
Customer: Stays on. 1998 E300
JA: What is the model of your '98 Mercedes?
Customer: E300 sedan
JA: Are you fixing your Sedan yourself? What have you tried so far?
Customer: I just waited for it to cool down then I went and drove it home.
JA: Anything else you want the mechanic to know before I connect you?
Customer: I don't think so.
Submitted: 10 months ago.
Category: Mercedes
Expert:  eautosales replied 10 months ago.

do you have access to a scan tool?

Customer: replied 10 months ago.
Customer: replied 10 months ago.
Expert:  eautosales replied 10 months ago.

The check engine light comes on when the on-board computer detects a fault in engine driveability or performance, transmission control system or transmission, or the emissions system, and a fault code is set and stored in the computer. Faults that can set the check engine light can range from a vaccuum leak, engine mis-fire, low engine compression, faulty sensor such as O2 sensor or other engine sensor, hydraulic pressure loss in transmission, transmission shift solenoid, open/short in wiring harness, emission evaporative system leak, or one of over a hundred different reasons.
The only way to know what set a fault code and turned the check engine light on is to have a diagnostic scanner hooked up to the on-board computer and read it for stored diagnostic fault codes. Many auto parts stores will do this service for free- (like auto zone)check with you local parts stores. If none in your area do, then you will have to take it to a shop and pay to have the computer read for stored fault codes.

Without knowing the fault codes numbers, it would be irresponsible to guess as to the cause as there are hundreds of possible causes

if you provide me a diagnostic code we can narrow down the cause of failure

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