Mercedes-Benz S420 When I slow down and stop the car, engine shuts off Inspection at your home or office.

Our certified mobile mechanics come to you 7 days a week between 7 AM and 9 PM.

Estimate price near me

Service Location

Customer Ratings

(13)

How A Diagnostic Works

Instantly book a certified mobile mechanic to come to you

Mechanic diagnoses the problem and quotes necessary repairs

Your vehicle is ready to go

Fair, upfront & transparent pricing for all services

Our certified mobile mechanics can come to you now.

Customer Ratings

(13)

When I slow down and stop the car, engine shuts off Inspection Service

How much does a When I slow down and stop the car, engine shuts off Inspection cost?

On average, the cost for a Mercedes-Benz S420 When I slow down and stop the car, engine shuts off Inspection is $95 with $0 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1995 Mercedes-Benz S420V8-4.2LService typeWhen I slow down and stop the car, engine shuts off InspectionEstimate$114.99Shop/Dealer Price$132.49 - $145.62
1998 Mercedes-Benz S420V8-4.2LService typeWhen I slow down and stop the car, engine shuts off InspectionEstimate$94.99Shop/Dealer Price$112.52 - $125.67
1997 Mercedes-Benz S420V8-4.2LService typeWhen I slow down and stop the car, engine shuts off InspectionEstimate$94.99Shop/Dealer Price$112.52 - $125.67
1996 Mercedes-Benz S420V8-4.2LService typeWhen I slow down and stop the car, engine shuts off InspectionEstimate$94.99Shop/Dealer Price$112.48 - $125.60
1994 Mercedes-Benz S420V8-4.2LService typeWhen I slow down and stop the car, engine shuts off InspectionEstimate$94.99Shop/Dealer Price$112.55 - $125.72
1999 Mercedes-Benz S420V8-4.2LService typeWhen I slow down and stop the car, engine shuts off InspectionEstimate$94.99Shop/Dealer Price$112.52 - $125.67
Show example Mercedes-Benz S420 When I slow down and stop the car, engine shuts off Inspection prices

Your car is designed to run like a well-oiled machine, but sometimes that machine struggles in unexpected places. There’s not always a warning light to alert you of this, but sometimes your car will be driving fine at road speed, only to die when you slow down and stop. If your engine shuts off at low speed, contact a mechanic immediately for a thorough inspection.

Common reasons for this to happen:

  • Malfunctioning transmission: In a car with an automatic transmission, the torque converter takes the place of the manual clutch and is responsible for transmitting power. If the torque converter is broken, or if there is a low fluid level in the transmission, the converter will not do its job, and the car will be unable to maintain power at low speeds, which causes the engine to shut off. A defective TCS or torque converter solenoid can also cause this issue.

  • Low fuel pressure, dirty or defective fuel injectors, or broken fuel pump: The fuel pump is responsible for transferring fuel from the tank to the engine. A malfunctioning fuel pump can result in low fuel pressure, which means that there is an inconsistent stream of fuel to the engine. At high speeds this doesn’t matter as much, but at low speeds a temporary pause in the fuel stream is enough to kill the engine. The fuel injectors are responsible for spraying a measured amount of fuel that is ignited by the spark plugs at the proper time. Injectors can become clogged or dirty over time resulting in erratic spray or no spray at all.

  • Bad oxygen sensor or mass flow sensor: The oxygen sensors and mass flow sensor determine how much oxygen is entering the fuel stream, and helps the vehicle adjust the air-to-fuel ratio. If there is too much or too little oxygen, your vehicle will not have optimal power. Just like with low fuel pressure, the car will continue to operate at driving speeds, but this suboptimal power won’t be able to fuel the vehicle as it slows down.

  • Loose or corroded wires in wiring harness: An inconsistently firing ignition will result in an easily stalled engine. If the wires don’t have consistent, constant, and reliable connection with the ignition circuit, the vehicle can lose voltage quickly, and it won’t have the power it needs to keep running as you slow down.

  • Faulty idle air control actuator: The idle air control actuator controls the engines RPMs when it is idling. This actuator receives information from the electronic control unit (ECU) so it knows at what RPM to keep the engine for a smooth and safe idle. When the actuator malfunctions, the engine gets no signal for idling speed and stops working.

  • Clogged or restricted EGR Valve: If your EGR valve is clogged, dirty, or defective it can cause your car to stall, idle erratically, or sputter, depending on whether it is stuck open or closed.

What to expect:

A top-rated mobile mechanic will come to your home or office to determine the source and cause of the stalling condition, and will then provide a detailed inspection report that includes the scope and cost of the necessary repairs.

How it's done:

The mechanic will likely need to test drive your vehicle to see if the problem can be replicated and will listen to the engine at idle to identify any misses, backfires, or other unusual noises. Next, the mechanic will use a scan tool to access the engine control unit or transmission control computer to find any information on stored codes.

Based on the engine performance, test drive and the diagnostic information, the mechanic will pinpoint where the issue is coming from, and let you know what parts need to be replaced or cleaned. Please be aware that this make take some time as oftentimes multiple items have the ability to cause this issue and the mechanic will often have to disassemble and inspect several parts before he or she can make a proper diagnosis.

How important is this service?

If you notice your vehicle stalling when you slow down and stop, park the car in a safe place and book a mechanic to perform an inspection as soon as possible. It is unsafe to continue driving under this condition and could result in further damage to your vehicle.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert Mercedes-Benz mechanics

Real customer reviews from Mercedes-Benz owners like you.

Excellent Rating

(13)

Rating Summary
12
0
1
0
0
12
0
1
0
0

Whitney

39 years of experience
783 reviews
Whitney
39 years of experience
Mercedes-Benz S420 V8-4.2L - Brake Pads Replacement (Front, Rear) - Palo Alto, California
He is great.

Tien

23 years of experience
903 reviews
Tien
23 years of experience
Mercedes-Benz S420 V8-4.2L - Water Pump - Moraga, California

Richard

17 years of experience
141 reviews
Richard
17 years of experience
Mercedes-Benz S420 V8-4.2L - Fan Clutch - Sacramento, California
good guy does the job and easy to talk to very friendly!

Tam

22 years of experience
251 reviews
Tam
22 years of experience
Mercedes-Benz S420 V8-4.2L - Fuel Filter - San Francisco, California

Excellent Rating

(13)

Rating Summary
12
0
1
0
0
12
0
1
0
0
Number of Mercedes-Benz S420 services completed
143+
services done by our mechanics
TOTAL NUMBER OF EXPERT Mercedes-Benz MECHANICS
1100+
experts on our platform

Recent articles & questions

5 Essential Things to Know About Driving in Bad Weather
Knowing how to drive in bad weather will help you stay safe. Drive slowly, brake early, and prepare for black ice to drive safely in bad weather.
P2140 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch E / F Voltage Correlation
P2140 P2140 code definition Throttle/Pedal Position Sensor/Switch E / F Voltage Correlation Related Trouble Codes: P2135: Throttle/Pedal Position Sensor/Switch A / B Voltage Correlation P2136: Throttle/Pedal Position Sensor/Switch A / C Voltage Correlation P2137: Throttle/Pedal Position Sensor/Switch B / C...
P0932 OBD-II Trouble Code: Hydraulic Pressure Sensor Circuit
P0932 means there is a circuit malfunction in the hydraulic pressure sensor, likely due to faulty electrical components or a defective sensor.

Seized engine, no oil leaks

Did your oil leak out from somewhere? Did your drain plug fall out? Did your engine have a major engine failure? I suspect the drain plug fell out on your engine. There have been incidents of the oil pan getting...

After i installed new front brakes, they started squeaking..............whats the problem?

Hi there, thanks for writing in. I'll be glad to help you with your question about brake noise on your 2005 Montana. Shims and high temperature grease must be used in this application, otherwise noise may occur. It is also...

When I turn on the ac its puts the vehicle in limp mode. All the fuses are good. With a multimeter I had someone hit the ac button and the battery reading was around 14.7 it should have gone down not up? 2005 Chevy Tahoe 4.8 V8

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com