Skip the auto shop - Our mechanics make house calls

Q: After changing the accelerator position sensor, the car will not start.

asked by on

After changing the accelerator position sensor, the car will not start. We were told to disconnect the battery and then hold the positive and negative cables together for a minute to reset the computer. We did this and the car still would not start. We then re-connected the old sensor (without mounting it on the bracket) and still no start. Theoretically (according to the parts people) the sensor required nothing to be reset. I just hooked up a battery charger at a 2 amp charge rate and it indicated 12 volts with 40% charge. We'll see, in the morning, if a full charge changes anything. If it doesn't we are at the end of our current knowledge of what to do! Any help will be greatly appreciated. While not totally ignorant in electronics, I'm far more comfortable with the mechanical end of things.
My car has an automatic transmission.

A: Hi, thanks for writing in. We get this ques...

Hi, thanks for writing in. We get this question quite often. Holding the battery terminals aren't supposed to clear error codes stored in the ECM. The correct procedure for clearing error codes that were stored in your ECM when the accelerator position sensor was damaged, is to connect a professional digital scanner and reset the codes. This needs to be done by a mechanic that has this type of device. Contact one of our local mechanics that can show up to your home or office to complete a check engine light reset inspection for you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: car won't start with new battery

Be sure the vehicle alarm is "off" so that no immobilizer system comes into play. "New" batteries are not necessarily sold fully charged, so the first thing to check is the state of charge of the battery or just simply...

Q: Instrument cluster is off with a P0600 reading

Hello there, the P0600 code is not one that is normally seen on your 2003 Mercedes ML350. The P0600 code tells us there is a communication link issue with the ECU. This may have been caused by the fuel pump...

Q: Slow oil leak

Hi. A temporary engine oil drain plug is just that - temporary. I suggest you have your oil pan and drain plug repaired as soon as possible. As for your shaking, it sounds like your rotors are warped. Warped rotors...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...