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Enes, VOLVO Master Technician
Category: Volvo
Satisfied Customers: 4900
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Rough starting, gas mileage drop codes, 644, 904,1300 among

Customer Question

rough starting, gas mileage drop codes, 644, 904,1300 among others
JA: When did you last clean or replace your air filter? And are the oxygen sensors in good working order?
Customer: air filter in the last year, o2 sensor code intermittant
JA: What is the model/year of your Volvo?
Customer: 2001 v70 xc
JA: Are you fixing your V70 XC yourself? What have you tried so far?
Customer: I have had it to a few mechanics, they don't like working on volvo's and I have done some work myself. It's had just about every system repaired or replaced
JA: Anything else you want the mechanic to know before I connect you?
Customer: the shop today said that they think its the throttle body unit but I just had it replaced a year ago by volvo
Submitted: 24 days ago.
Category: Volvo
Expert:  david craig replied 24 days ago.

Hi Im David, thanks for visiting the site, allow me a few to pull up some info on your vehicle. thanks

Expert:  david craig replied 24 days ago.

usually the 644a codes is set due to the vvt solenoid on top of the engines, exhaust cam, having a fault internally. you can check the resistance should be less than 3 ohms.

Expert:  david craig replied 24 days ago.

is it 644 or 644a ? and what exactly are ALL the codes.......

Expert:  david craig replied 23 days ago.


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