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Ask Chad Farhat Your Own Question
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Mercedes
Satisfied Customers: 3644
Experience:  Owner at Carolina Auto Service & Sales , 20 years experience in Foreign & Domestic vehicles
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I own C240 2001and he had a check engine light on ,so i use

Customer Question

Hi, i own C240 2001and he had a check engine light on ,so i use a scanner and he give me a P0120 reading . At this time the car cant start and also the reading says 2 sensors Htr and EGR trouble . What can i do?
Submitted: 1 year ago.
Category: Mercedes
Expert:  Chad Farhat replied 1 year ago.

Hi, I'm Chad ,Welcome To JustAnswer, I'm reviewing your question and I will be be posting a replay ASAP

Expert:  Chad Farhat replied 1 year ago.

what were the other fault numbers for the O2 sensors & EGR fault ?

please let me know

Thank You

Chad

Customer: replied 1 year ago.
The Htr and the EGR the scanner was on red they did not give me a code only a incomplete reading
Expert:  Chad Farhat replied 1 year ago.

ok no problem

what is the mileage on car now ?

you said car want start , does it crank over and it does not start, or you cant even crank it ?

how did it die on you ?

Customer: replied 1 year ago.
140,000 and the car can't crank i turn the key and he do nothing.
Expert:  Chad Farhat replied 1 year ago.

but battery is good . did you check for 12 volts on battery ?

is there a security red light flashing or steady on , when you turn key to start on the dash , have you noticed?

Customer: replied 1 year ago.
i change the battery is new and the security light is steady
Expert:  Chad Farhat replied 1 year ago.

well steady is not good , should go out when you turn key to on or start , the alarm is triggered on ?

Expert:  Chad Farhat replied 1 year ago.

when did you change battery , when this happened or before ?

and was the security light on before battery change ? and did the battery die and that is why replace it and now light is on?

Customer: replied 1 year ago.
Ok i change it when the car wont start i think it was the battery and yes the light was on before
Customer: replied 1 year ago.
The P0120 says pedal position sensor i dont know if that help you
Expert:  Chad Farhat replied 1 year ago.

sorry , i was finishing up another call

Expert:  Chad Farhat replied 1 year ago.

does your keyfob has the small blade key that you can pull out ,so you can unlock and lock door with ?

Customer: replied 1 year ago.
Expert:  Chad Farhat replied 1 year ago.

Lets try that if you are with the car

Master reset Procedure

1- Disconnect Battery Cables ( Negative & Positive Cables )

2- Hold both battery cables Together for 20 secs ,then let go

3- Wait 10 minutes

4- Make sure all doors are closed

5- Reconnect battery Cables

6- Lock & unlock the vehicles using the key from driver door

7- Enter the vehicle and attempt to start

Customer: replied 1 year ago.
No im not with the car right now but i will do that
Expert:  Chad Farhat replied 1 year ago.

we definitely have an alarm triggered , if that don't work, then you need to have the anti theft module read by a scanner and retrieve the fault code #

to know what component in the system failed .you can post them back here when you get them and i can help further if you need me to.

I m online from 10 am till 12 pm daily , so just let me know

Hope I was helpful to you , please let me know if you need anything else on this issue

A Positive Rating is Much Appreciated

This Post will stay open for you to come back and ask me any follow up questions you may have on this issue even after you rate me

Chad Farhat
ASE Certified Technician

Customer: replied 1 year ago.
Ok thank you
Expert:  Chad Farhat replied 1 year ago.

you welcome

Customer: replied 1 year ago.
Im sorry i went to the car a do what you told me the security turn off but it did not start, just to let you know.
Expert:  Chad Farhat replied 1 year ago.

unfortunately we need those fault codes now since it is a hard fault that it will not reset, a component has malfunctioned .

get the scan and get me codes and i can tell what you need ., wish it worked for you .

a lot of times they do if that was the firs time it happens and it lost synchronization with key but obviously we have a different issue here .

Expert:  Chad Farhat replied 1 year ago.

hey how are you

did you get it fixed or if you like some more help please just let me know ?

Please dont forget to rate me before you exit since that is how we get compensated

Thank You

Chad