Question about 2004 Chrysler Crossfire

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I have two engine codes 171 and 174 engine is running fine how do i repair them

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Well code 171 is telling you the fuel mixture is too lean for bank one and code 174 is too lean bank two.
So the most common cause is low fuel pressure.

Posted on Apr 12, 2015

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I have engine codes 171 and 174 engine is running fine how do i repair thease codes


Check vacuum lines. Codes are for O2 sensors. bank one and two running lean. Make sure the air plenum is tight to the throttle body.

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On my 2002 yukon 1500 I have trouble codes of 171,174, 420 what is my problem


Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 2 is generally the side of the engine that doesn't have cylinder #1.
Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.
You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.
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How do i get rid of service engine soon when there is nothing wrong with the engine


Even though the engine is running fine ther still may be an issue which is why the light comes on. The first thing to do is pull the codes. his will help identify the system, sensor, or control device that is not working properly. Once youu know why the light is on you can then focus on a repair to that problem. Once the repair is made the codes can be cleared. If the repair was sucessful the light will remian off. If the repair was not successful or a repair is not made or attempted the light will come back on.

you can check codes three ways.

buy a code reader for about $50 and do it yourself.

Call your local parts store and see if they will pull codes for you.

Bring the car in to a service facility and have them run a diagnosis. there is usually a fee for this.

let me know what you find and I'll be happy to help.

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1 Answer

Keep getting ses codes p507 p171 p174


The codes you show are all about air leaks. The 507 is about the IAC and may simply be the system noting the connection was unplugged.

The 171,174 are lean codes and usually mean more air is coming in than is needed. Did you use a water mist to check for leaks? Have you checked Vacuum solenoids for leaks?, the EGR diaphram?

You did not indicate the engine and vehicle this problem was on. Some of the 6 cylinder products had sandwich type manifolds and the upper and lower chambers had a gasket which would dissolve and leak internally.

Some people have had problems with the runners on dual plane manifolds, but I question whether a 171, or 174 could generate from this defect.

I think you should retest with a water spray after clearing the computer.

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Mis fires


The engine in your car is designed to run smoothly with maximum power output and produce as minimal emissions as possible. When your car's engine is not performing properly it can cause, low gas mileage, low power output, increased emissions and possible internal engine damage if left untreated. This troubleshooting guide is designed to isolate the malfunctioning cylinder and troubleshoot to repair the problem. Before we start we need to know one of two things; is the engine running poorly at idle only and seems to be ok under power? Or does the engine run fine and it's just the engine idle condition that is the problem. If your engine is idling rough please visit, engine misfires at idle If your engine cranks over but won't start visit engine wont start. If your engine won't crank over visit engine wont crank over. If your engine is running rough all of the time or intermittently you are in the right place. Below we have created a guide to aid diagnoses and repair procedure for most common rough engine running problems.

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I have a 2002 nissan altama 4 cylinder with 87,000 miles on it.check engine light on,but it is runing fine.i took it on a 150 miles trip and it still runs fine.what do u think the problem is.i took it to...


Hello and thank you for using FixYa!

I think you mean the code is engine speed sensor. This is caused by a crank sensor on it's way out. I would have the code double checked by a professional, and have the repairs done to correct this. Cause if it's what I think it is, a crank sensor will leave you stuck.

Thanks Jay!

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Check engine light is on,codes 171,174,system lean,codes came back as 2 oxygen sensor's before cat/conv,do they need to be replaced or could it be something else causing it, any help would be great!!!


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