Auto Repair 85016 Understanding Labor Hours

Hours of Labor Defined

A client asked a question about the hours billed on a repair order. Jill is the clients name and Jill’s question is simple. She does not know what the hours of labor indicates in real-time. One hour of time on a clock is 60 minuets, that is easy. Divide 60 minuets by 10.

(60 divided by 10 = 6 minuets or .1 hours of labor)

Labor time on an auto repair invoice is calculated in tenths of an hour (.1 hours = 6 minuets) Some clients never look at the hours of labor, just the total at the bottom.

The time it takes to remove, repair and replace the parts is called a labor operation. Every repair on a vehicle is calculated this way. A labor guide is used to look up the labor for a repair. Every car is different and will have different billable hours for similar tasks. A water pump R/R on a V8 rear wheel drive car is different from a V6 front wheel drive car.

Now let’s look at Jill’s invoice labor. She had an oil change @ .3 hours and a tire rotation @ .2 hours. So the labor for her visit was .5 hours (x) the shop rate = total labor billed.

Now this is how some clients get confused. Jill was at the shop for about an hour but the time on the job was .5 hours not 1.0 or a full hour.

Doing the paper work takes time and some of the time is used just waiting for the oil to drain out. The billed hours, are for the work preformed on the vehicle during the visit at the shop. Billable labor is easier to understand that your phone bill, but if you have questions about labor stop in at the shop anytime during the weekdays.

It’s all good under the hood. Anthony Xavier ASE Master Technician

copyright: All rights reserved @ HeyAnthonyAZ.com 2013

P0128 Engine Code Dodge Magnum

Dodge Magnum Check Engine Light on, code P0128

When the check engine light turns on, it indicates that the computer sees a fault.  When the engine computer sees the fault, it will store a code.  The code will direct the repair technician to an area to test.  Today I have a 2005 Dodge Magnum with a P0128 code.  This code is basically the same for any make or model.  This is a standardized code for O.B.D. 2 cars and trucks.  P0128 is for Engine Cooling System Thermostat Rationality.  The engine computer (PCM or ECM) predicts what the engine coolant temperature should be, based on the engine coolant temperature at start-up.  The predicted engine coolant temperature is then compared to the Engine Coolant Temperature Sensor (ECT)  The error between the two is calculated and integrated with respect to time.  When the Thermostat diagnostic runs, the integrated error is compared to a calibrated threshold and a pass or fail is then determined.  Many things can cause the code to set, but they all have one thing in common, Engine Temperature.  Any electric or mechanical component that can affect engine temperature readings will cause the code to set in the computer, even a faulty computer.

The image above is from the Dodge Magnum.  The black rubber body around the center disc failed.  (new on left vs old on right)  The rubber is in place to make a tight seal around the outer body.  This rubber sealing ring keeps coolant from flowing untill the engine reaches the correct temperature.  If coolant flows too early, the code will set.

The engine computer is looking at the coolant temperature to adjust timing and fuel delivery for best economy.  A faulty Thermostat can cause reduced fuel economy, poor heater operation and hard shifting from cars with automatic transmissions.

It’s all good under the hood. Anthony Xavier ASE Master Technician

copyright: All rights reserved @ HeyAnthonyAZ.com 2013