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john -aka eauto
john -aka eauto, The Car Guy
Category: Ford
Satisfied Customers: 15999
Experience:  ase tech over 15 years in the field
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My Wrench light comes on What does it mean. The Transmission

Customer Question

My Wrench light comes on What does it mean. The Transmission was rebuilt last year
JA: Thanks. Can you give me any more details about your issue?
Customer: THe vehicle is working good. However the check engine light also came on. No problems with the vehicle working
JA: OK got it. Last thing — Ford Mechanics generally expect a deposit of about $28 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 1 year ago.
Category: Ford
Expert:  john -aka eauto replied 1 year ago.

The check engine light or wrench 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.

Expert:  john -aka eauto replied 1 year ago.

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