Question about 2003 Mazda Mazda6

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03 Mazda 6: Check engine light on, code po174

I have an 03 Mazda 6 and was recently given the code p0174 after a basic diagnostics test. I was told this might be a problem with the oxygen sensor. However, I also know I have a leak and need an oil pan gasket replaced. Could that be causing the ''check engine'' light to flash and the code to appear? Should I just fix the gasket and see if the light goes out after a few drives?

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The oil pressure sensor does not have much to do with the P0174 code so the leak on the gasket is not the cause, usually it is the air mass sensor, or the intake sensor. if you have a leak of oil, this might as well mean that whoever changed the oil did not put the right specs of it and this caused the oil to get through. After some time you will experience that the rpms will reach only certain level and won't go higher. Change oil to the right specs and get the sensor cleaned if not to late or replaced (will be expensive). Gasket change wil be needed as well.

Posted on Jul 25, 2009

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2 Answers

Check engine light on; engine codes P0171 and P0174


p0171 is lean exhaust bank one ( passenger side) and p0174 is lean exhaust bank 2 ( drivers side). First we need to look for vacuum leaks, low fuel pressure, Intake air leaks after the mass air flow sensor, pvc system. Because you have both sides lean I would start looking at these spots.

May 23, 2011 | 1998 Ford F150 Regular Cab

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2003 Mazda6 S 3.0L 6Cyl. Car shakes between 20-30mph, 3rd gear. Car has 94,000 miles on it. I'm also getting very bad gas mileage, I have an 18 gallon tank and I'm getting 240-260 mph highway and city,...


Your check engine light should be on. There is obviously a problem. The best course of action is to have the engine scanned for codes. The on board diagnostics should have stored one or more trouble codes, based on the information you have given. A good auto parts store will scan your computer for free. Any diagnosis at this point would be guessing, and not based on factual information. It could be anything from a bad sensor, to needing a tune up, to a plugged catalytic converter. Get the codes and let me know what they are and we will try to figure out a solution based on that information.

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Code P0174 05 Corolla


I don't show any po174 for an 05 corolla. But I do show a po741, if thats the code you're getting.
It means theres a problem with the torque converter
clutch system. It could be the tcc solenoid. Either way, it's related to what you just had done.
Good luck.

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Yes my truck is 1998 ford f 150 4.2 an i have code po174






DTC code p0174 means "System too lean (Bank 1)"

Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exahust). On V6/V8/V10 engines



, Bank 2 is generally the side of the engine that doesn't have cylinder #1.

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1 Answer

What do these trouble codes mean p0171 and p0174


po171 is system too lean,bank 1,po174,is system too lean,bank 2,It sounds like a fuel pressure problem.

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