Question about 1996 Mercury Grand Marquis

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Vacum leck in manifold gasket

Trouble code p0170 and p0171

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Check the pcv hose at the intake manifold

Posted on May 03, 2014

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How to fix code p0170 in a 2000 subaru outback


P0170 Fuel Trim Malfunction (Bank 1) OBD-II Trouble Code Technical Description Article by Dale Toalston ASE Certified Technician Fuel Trim Malfunction (Bank 1) What does that mean? This code is one that surfaces with certain makes of automobiles more than others. In writing this article I've added Mercedes-Benz-specific info since it seems that M-B (and VW) are most prone to having this P0170 surface along with misfire codes or other fuel trim codes. P0170 means there was a malfunction in the computer's control of the air:fuel ratio. It also indicates that the fuel trims reached their limit of adding fuel while trying to compensate for a actual or perceived rich condition. When the fuel trims reach their rich correction limit, the PCM (Powertrain Control Module) sets a P0170, indicating a problem or malfunction in the fuel trims. It may also have a P0173 referring to the same malfunction but on bank two. Symptoms Symptoms of a P0170 DTC may include: MIL (Malfunction Indicator Lamp) Illumination Start and stall Poor fuel economy Black smoke at tailpipe Hesitation/misfire at idle or under load Causes Potential causes include a vacuum leak, unmetered air leaks Fuel saturated engine oil Leak in turbo air charge hoses (if equipped) Possibly bad O2 sensor (If Mercedes, may require adaptation with M-Benz compatible scan tool.) Oil contamination in MAF connector or O2 sensor connectors. Also check ignition coils, cam and crank sensors, and oil sensor for leakage contributing to oil intrusion in wiring harness. Defective MAF (Mass Air Flow) sensor (especially on Mercedez-Benz and other European autos. There are a lot of problems with aftermarket MAF sensors.) Defective fuel pressure regulator Leaking camshaft adjuster solenoids (Mercedes-Benz). NOTE: for some Mercedes-Benz models there is a service recall for a crankcase vent hose located under the intake manifold. It should be checked for leaks/cracking and also operation of check valve in the hose. The check valve should flow only one way. Possible Solutions It should be stated right off the bat that the most common problem associated with this code is the MAF sensor or air mass meter. This is especially the case with Mercedes-Benz and Volkswagen and other European cars. At time of writing, you don't normally see this code with American-made cars, and minimally with Asian, and, to be honest, I have no idea why. It appears to me that the PCM (powertrain control module) logic used by some European car manufacturers to set a P0170 (or P0173) fault code simply isn't used by American vehicle manufacturers. It is more common to see P0171, 0174, 0172, 0175 codes set with regard to fuel trim malfunctions on American cars. There is very little information on the setting conditions for a P0170, or P0173, but what information that is available almost seems to be a redundancy of the P0171,4,2 & 5 setting conditions. I'm sure there's a reason for it, but I can't get anyone to tell me what that is. The similarities between them may be why we don't see this code surface on domestic vehicles very often. It's simply unnecessary. So, simply put, if you have a P0170, your PCM noticed that the fuel trims reached their rich correction limit. Basically it's adding fuel to try to compensate for a lean condition, real or perceived. If you have this code and access to a scan tool, observe the MAF sensor reading in grams/sec. The reading will be different for different automobiles, so get a good spec. I'm going to stick with what would be normal for a Mercedes (1.8L), since they have the bulk of the trouble. Expect to see at idle 3.5-5 g/s (ideally). At 2500 RPMs with no load it should be between 9 and 12 g/s. On road test, at WOT (wide open throttle) it should be 90 g/s or well above. If it's not in specs, replace it. Be careful of Ebay MAFs. Often they don't work according to OE specifications. If the MAF checks out and there is no oil intrusion at the connector, check fuel pressure and ensure that there are no leaks at the regulator internally or externally. Check all vacuum hoses and confirm none are cracked, disconnected or missing. Make sure there are no vacuum leaks at the intake manifold gaskets or tears in the air supply hose. If the engine is turbo charged, be sure the hoses are in good condition and have no leaks. Leaking turbo pressure hoses could cause a rich condition. Inspect the condition of crankcase vent hose under intake manifold and operation of check valve in the hose. (In the "What are the causes?" section) If there doesn't appear to be any problems with the fuel pressure, MAF or vacuum hoses, then inspect the O2 sensor connectors for oil intrusion. A bad O2 sensor could cause a P0170, or P0173. Repair cause of oil leak and replace oil-fouled O2 sensor.

Read more at: http://www.obd-codes.com/p0170
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May 13, 2015 | 2000 Subaru Outback

3 Answers

Code p0171 and p0174


P0171 possible cheap fix

Feb 21, 2015 | 2002 GMC Sierra 1500

1 Answer

2006 kia spectra oem code p2626, p0171, p0170??


P2626 O2 Sensor Pumping Current Trim Circuit/Open
P0171 System too Lean (Bank 1)
P0170 Fuel Trim Malfunction - Bank 1.

Try changing the fuel filter first. Then you will have to clear the code with a jumper.

Check here:
http://www.troublecodes.net/Kia/

Oct 28, 2013 | 2007 Kia Spectra LX Sedan

1 Answer

2002 accent p0171 lean mix and cyl 1 and 3 missfire cant find any vacum leaks any ideas was going to try frount 02 sensor


bad oxygen will idle speed also clogged fuel filter,faulty fuel pressure regulator, dirty fuel injectors will cause engine to rough idle.

Dec 06, 2011 | Cars & Trucks

1 Answer

Error code 01710 car stalls and will not start for a few minutes


Hyundai has P0171 and P0170 codes. What does this mean??...and took it to Autozone to run a check engine light test on it. The codes that came back were P0171 and P0170? The possible problems were system too lean, fuel syst fault, ignition syt fault, en...


p0171 and p0174 both banks lean

Feb 27, 2011 | 2001 Hyundai Santa Fe

3 Answers

CODE P0171 KEEPS ON COMING BACK ON,REPLACE O2 AND MAP


Hi Jonah,

I have the same problem and it only propped up after i had my exhaust manifold repaired, do you think the mechanic didnt do the weld it right?

James
2001 Saturn L200

Apr 27, 2010 | 2000 Saturn SL

1 Answer

Trouble code p0171 . truck runs and idles very poorly


po171 bank 1 fuel trim system lean,the problem with these is the intake manifold gasket it leaks vaccum. will make truck run bad, in the am may be even worse. replace the intake gasket that will solve your problem. ive done a few of them. hope this helps.

Jan 30, 2010 | Chevrolet Silverado 2500 Cars & Trucks

2 Answers

What causes dtc p0170 for a 05 kia sportage


code po170 fuel system too rich or too lean bank 1. this is 5 possible causes 1. air leaks present in the exhaust manifold or exhaust pipes.2.air being drawn in from leaks in engine gaskets or other seals. 3.incorrect fuel pressure or one or more fuel injectors has failed. 4.front ho2s element is contaminated or has failed. 5.a fuel control sensor is out of calibration- baro sensor - ect sensor - iat sensor.

Nov 24, 2009 | 2005 Kia Sportage

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