Since the car ran in fail safe mode I have been having misfiring problems. Could there be a link? The misfiring has only happened on add number cylinders. What cylinders are disabled during fail safe mode?

2004 Ford Explorer Fail Safe Mode Computer Problem 2004 Ford

After about 6 to 7 years all the ignition coils fail

Keep diagnosing the cylinder misfire issues

Need professional scan tool software, to use Mode $06,
& look at other data, as your not going to get a perfect
fault code every time & just replace a failed part

There are times when professional tools won't work & you
have to walk a new coil or use a scope on a road test & that
could take months before the coil goes down

How about the spark plugs ?
Over 3 years old ? loose them

Smoke the intake-- for vacuum leaks

Look at fuel trim for that bank with the Misfires

O2 Sensors over 100,000 miles

Fuel Pressure Correct at fuel rail?

You need an owners manual or access to factory
manuals to find out how many fail safes your vehicle has

Example: Electronic Throttle Control
Engine Over Temp
Transmission Failsafe
Misfire Fail safe to protect converter

Once you have checked for codes which I assume you have
done long ago,you use them as well as trouble charts to
diagnose things

2005 explorer showing engine fail safe mode and wrench

when a car goes into fail safe or limp mode it is caused by an inportaint sensor the car needs to either run the motor or shift the trans..ikt then runs or operates on the driving info that the ecu has stored to be able to get it home or to a shop..youj will need to have a diagnostics ran on it and have the cars computer read to retrieve the code to idenify the problem and once the problem componet is replaced the car will automaticly return to normal operation

This just happened to me. I drove the beetle in the snow and slid up to a stop sign. The slide engaged the anti-lock brakes. After that, the car was sluggish starting out and would not shift into 4th gear.
Turns out, the transmission was stuck in 3rd gear. If you can believe it, this is by design! It's a fail safe mode that gets triggered by the wheels spinning out of sync.
According to my mechanic there are wheel speed sensors on each wheel. If the computer senses the wheels moving at different speeds it will drop into fail safe mode. This requires a special scan tool to clear the codes.
Once the codes were cleared, ran like new.

P2104 Throttle Actuator Control System - Forced Idle
P2107 Throttle Actuator Control Module Processor
P2110 Throttle Actuator Control System - Forced Limited RPM
P2111 Throttle Actuator Control System - Stuck Open
P2112 Throttle Actuator Control System - Stuck Closed

Seems like Throttle Actuator is the problem.

Good luck on this repair.

Re: 2000 Volvo S40 L4 1.9 Liter L4 1.9 Liter Turbo FI

Are you consider yourself a handy person?

Swap the coil and see is the misfire going to follow to another bank of cylinder.

You has total of 3 coil in your engine.

Do a detail record map and switch the two coils.

A replacement aftermarket coil is oil $46 w/one year warranty and $55 will get you a life time warrent coil.

Do the swap and see what happen.

A leaky/failing injector can also cause the same problem.


Do a Chevron Techron fuel injector clean ran and highway ran.

Good luck

I encountered the same problem, my engine fail safe mode light came on and shut the car down. I took my car to my mechanic and he found the solution to the problem. The car needed a throttle body cleaning and the fuel filter needed to be replaced. After having my truck serviced my mileage increased from 14.6 mpg to 15.4 mpg
ENGINE FAILED SAFE MODE WARNING LIGHT, GONE Total cost $86.45

po303 is misfire on number 3 cylinder. It could be a bad spark plug or wire, maybe a loose plug wire, could be alot of things. injector problem drop of water in fuel that happened to hit that cylinder. but most likely a plug misfired. I would clear the code and see if it happens again. If so give care a tune up.