Code: P0171 System too lean [Archive]

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lyndonvang

01-24-2007, 10:30 PM

I have a mazda speed 2003.5 and when I used a diagnostic it read "P0171 System Too Lean". Have any of you guys have this problem? Ho do you fix it? What is the problem?

Thanks

mspHtown

01-25-2007, 12:56 AM

do you have any mods?

JDM Sam

01-25-2007, 04:19 AM

Check the usual torn actuator or vacuum leak usually in the lines or intercooler plumbing.
Get your replacements here
http://***********************/mazdaspeed2.htm

Blackrose

01-25-2007, 05:00 PM

Leading causes for P0171 - Vac leak and exhaust leak.

Other rare causes - Fuel system begining to fail. Bad primary O2 sensor. Bad Maf sensor. Bad tank of gas. Used the wrong gas type ( IE. E85 or methonol varient).

Most common in MSP - Vac leak. Normally via bad WG actuator diaphram. Stock Vac lines are kinda cheap to and prone to crack.

GreySpeed

01-25-2007, 05:35 PM

Yup, same code mine pulled up when the actuator was broken.

lyndonvang

01-27-2007, 01:45 PM

After fixing the actuator was it able to run smoothly with out hesitaiton?

msp35

01-27-2007, 03:51 PM

Yes, well as smooth as a stock MSP will run.

elmer1987

04-06-2007, 02:14 PM

actuator? where in the car? and where to buy a replacement? easy install? how will i know if it needs replacing?

alexB

04-07-2007, 11:14 AM

Yup, same code mine pulled up when the actuator was broken.

I have heard that when you blow into the vac line to the wastegate it should have some resistance. And if not it is probably bad. Well I threw this code also recently and did that test. Seems to have resistance. Could it still be bad? Also my car has a slightly rough idle and jerky acceleration until higher rpms.(3200)
I have been unable to pinpoint the problem.