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Drew
Drew, Super Mazda Tech.
Category: Mazda
Satisfied Customers: 2188
Experience:  19 yrs. experience. Mazda Senior Certified Tech, with Ford, Linc. & Merc. experience. ASE L1 Advanced Certified Master Tech.
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The check engine light came on in my 2003 B4000 4X4 pickup.

Customer Question

The check engine light came on in my 2003 B4000 4X4 pickup. My son had a diagnostic tool and it showed the codes P0171 and P0174. Whatdo these codes mean?
JA: Does the light stay on, or does it blink?
Customer: Stays on but went off after his diagnostic check.
JA: Are you fixing your B4000 yourself? What have you tried so far?
Customer: Don't know what the codes mean. Have to know that before determining that.
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 2 months ago.
Category: Mazda
Expert:  Chad Farhat replied 2 months ago.

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

Expert:  Chad Farhat replied 2 months ago.

Hey how are you

this the

DTC : P0171

I sent you the troubleshoot tree , it is pretty long .

Expert:  Chad Farhat replied 2 months ago.

ask your son ,can he get the fuel trim readings from his scanner if his scanner is capable if pulling those .The long term & short term fuel trim readings at idle

and also Fuel system status : is it open loop or closed loop it show on his scanner

if you can , i can narrow it down to what it could be .

1- check vacuum leaks

2- mass airflow sensor

3- Pcv system

Please let me know

Thank You

Chad Farhat

ASE Certified Technician

Expert:  Chad Farhat replied 2 months ago.

Hey how are you ,this Chad from JustAnswer

I was wondering if you like any further assistance on it

Please let me know
Thank You
Chad Farhat
ASE Certified Technician

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