Question about Mazda B4000

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I have a 2003 Mazda B4000 (manufactured in June, 2003) which has bee throwing the P0171 & P0174 code. I have had it to a mechanic twice. The first time there he did the smoke test and found no vacuum leaks anywhere but changed my fuel filter as it was extremely plugged. The CEL stayed off for about a week then came back on. Same two codes being displayed...took it back and he cannot find the issue. The truck is running fine, no hisses no loss of power or anything. He also said he cleaned the MAS and does not think the O2 sensors are gone. The truck has about 85,500 kilometers on it (53,500 miles) so because it is not a vacuum leak, could it be a shot MAS sensor? Another problem I've heard what could be the issue is there is a rubber elbow on the intake under the throttle body cover and under a coolant line on the right side of the engine. If one of these rubber elbows cracks or splits it will throw these two codes, but would it make any strange noise or is it a visual problem? I've read if it is split, when the engine is running, this elbow will flatten. Thanks in advance...

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I would check it at any rate and hows the air filter?

Posted on Nov 07, 2010

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