Question about 1996 Mercury Cougar XR7

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01 gmc jimmy with codes bank one and bank two to lean

If i drive the vehicle hard it will run rough then if i give it time to i guess "catch its breath" it will run fine.

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Those codes mean that you might have bad o2 sensors on bank 1 and 2 but can also be caused by bad fuel mixture

Posted on Jun 22, 2009


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2002 gmc envoy 4.2 liter 6 cyl code reads bank 1 too lean

too lean can be from leaking manifold, vacuum leak, injectors on that bank, low fuel pressure

Aug 02, 2015 | GMC Cars & Trucks

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I have a 2001 Jimmy with "Service Engine Soon"

P0171 System too lean bank 1
P0174 System too lean bank 2

Last time you changed your fuel filter?
Look for any vacuum leaks.

Sep 05, 2011 | 2001 GMC Jimmy

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2001 gmc jimmy po171 lean bank code what could be the fix is it a possable o2 sensor

More than likely bank 1 sensor has a possible vacuum leak, or a lean misfire on that side of the bank.(lean misfire happens when gap of spark plug are exceed due to wear), As for the 02 sensor I agree that it is reporting the true engine condition on that side of the bank

May 01, 2011 | 2001 GMC Jimmy

1 Answer

Rough idle vibrates and po171 code service engine soon.

Hi, a Ford P0171 is a LEAN code for cylinder bank 1, and P0174 is a LEAN code for cylinder bank 2. These codes commonly occur on many Ford vehicles, and are set when the powertrain control module (PCM) sees the air/fuel mixture is running too lean (too much air, not enough fuel).
When the Check Engine Light comes on, either one of these codes, or both, may be found when a code reader or scan tool is plugged into the vehicle diagnostic connector. IF the vehicle is driven long enough, typically both codes will be set.
A P0171 lean code for bank 1 is the cylinder bank on the RIGHT (passenger) side of the engine on Ford vehicles with a V6 or V8 engine and rear-wheel drive.

A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance.
Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow (because the EGR differential pressure sensor that monitors EGR flow is faulty and is under-reporting EGR flow).
If the problem is not enough fuel, the underling cause may be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors.

Mar 24, 2011 | Ford Escort Cars & Trucks

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Specifically sensor 3 bank 1 oxygen sensor 2000 GMC Jimmy 4.3L v-6 4wd

Skolruby, There are four different codes for bank1 sensor3 as i think you may have written it backwards. It goes as follows, code po143 ho2s circuit low voltage bank 1 sensor 3 po144 ho2s high voltage bank1 sensor 3 po146 ho2s circuit insufficient activity bank 1 sensor 3 po147 ho2s heater performance bank 1 sensor 3. If you are getting code 44 lean exhaust. or 45 rich exhaust, It will show up on an emmisions test witthout the check engine light on and fail. If you get code 45 you might have a csefi fuel meter leak, A common problem with this engine. It is hard to detect unless you dissesemble it and see raw gas by the plastic injector tubes. I have the same year and model jimmy. It took days on a diagnostic machine to shake it out, What a pain. good luck.

Feb 15, 2011 | GMC Jimmy Cars & Trucks

2 Answers

I have 2 trouble codes. #1- o2sensor circuit stuck lean sensor 1 bank 1 and #2 is the same except it's sensor 1 bank 2! could these 2 codes make the car very rough and have no power to move?

Yes but its very unlikely that both 02 sensors went bad at the same time.

If youe engine is starving for fuel, it will run lean, have no power, and set these codes.

You arent running e85 fuel are you? That stuff sucks and most vehicles do not run well on it.

I would check the mass airflow sensor to make sure its not dirty, check the air intake tube to make sure its not cracked or out of place, and then test fuel pressure and volume.

I suspect a fuel issue of some sort. ( pump or filter etc) Its kind of hard to say without looking at it myself in person.

what year/make/model mitsu are we talkign about here?

Nov 24, 2010 | Mitsubishi Eclipse Cars & Trucks

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Code 1416 bank 2 2000 gmc jimmy

P1416 - Secondary Air Injection (AIR) system Bank 2
1416 means that you are running lean while the smog pump is on.
It could also be likely the vacswitch on the smog pump is the causes.

Jan 31, 2010 | 2000 GMC Jimmy

1 Answer

Error codes appeared on 2003 GMC Yukon PO170 too lean bank 1 PO174 tool lean bank 2 PO300 multiple cylinder misfire Still runs OK, idles a bit rough.

Check the intake manifold gaskets for leakage. It will tend to run rougher in the morning when it is cold. Check for vacuum leaks on any hose connected to the intake plenum too.

Dec 13, 2009 | 2003 GMC Yukon

1 Answer

Did a tune up on 96 gmc jimmy and still running

have vehicle scanned for code[check engine] problem may not be tune up sum auto stores such as auto zone/ advanced auto do it for free the code gives u a place to start

Oct 20, 2009 | 2001 GMC Jimmy

3 Answers

2001 GMC Jimmy Idling rough

P0300 is multiple misfires.
P0171 is lean burn on left bank 1 means drivers side
02 sensor is faulty. Your vehicle is over fuelling that is why your are getting P0300 code and the rotten egg smell. Good idea is to replace both 02 sensors.

Apr 04, 2009 | 2001 GMC Jimmy

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