Question about 2004 Mazda RX-8

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Engine light is on and is giving code for running lean

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Air leak after the maf,map sensor some where in the inlet.
Air leak in the exhaust before the lamda sensor which is cause by a ole in exhasut.
investagate these areas which might point you in the right dirrection

Posted on Jun 04, 2009

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6ya6ya
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Posted on Jan 02, 2017

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wyatt1582
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SOURCE: lean bank 1

Check for a lower intake leak somewhere air is getting in on 1,2,3. Check for leaking vaccum hoses also.

Posted on Mar 26, 2009

csmock132
  • 4669 Answers

SOURCE: check engine light on code 171and 174

Sounds like a dirty Mass Air Flow sensor.

Posted on Mar 26, 2009

  • 15 Answers

SOURCE: 2002 grand prix runs rough,dies service engine

sounds like you have a vacuum leak, check all the vacuum hoses and replace any broken or kinked ones, also check around the intake manifold gasket for leaks. any air leaks after the air flow meter creates 'un-metered' air which inturn will make the car run rough and stall, hope this helps

Posted on Apr 04, 2009

  • 142 Answers

SOURCE: engine light on 3 codes in system

The lean running codes are related to the p-1000 code...

Running lean on bank 1 and bank 2 means your oxygen sensors sense too much oxygen in your exhaust flow. This means either your engine is getting unmetered air (air that the engine does not know is coming in, therefore does not send fuel to compensate for...) (air that your mass air flow sensor does not see). You could have either a bad mass air flow (MAF) sensor (in the intake piping after the filter; this sensor tells your engine how much air it's taking in, so it can send the right amount of fuel through the injectors to properly burn with the air available with as little emissions as possible), or you could also have a cracked/broken intake piping after this sensor which lets air in the intake that the sensor does not measure... A large vacuum leak could also let unmetered air in the engine.

Or... Another possibility here would be low fuel pressure (bad fuel pump, bad fuel pressure regulator, fuel leak), as not enough fuel for the air would also cause the same lean condition.

It could be that some oxygen sensors are bad...

These conditions are hard to pinpoint exactly unless you have a scanner that can read sensor data (MAF Flow, fuel pressure, oxygen sensor values)...

The first thing I'd do would be to check for cracks or damage in the intake piping... If there is none, then it might be a low fuel pressure issue, or sensor problems...

Posted on May 08, 2009

1fastbob
  • 301 Answers

SOURCE: my 2001 cadillac deville keeps giving me dtc code system to lean

Anytime I get a too lean DTC I first change the fuel filter if it hasn't been changed in awhile. You'd be surprised how many times this has helped.

Good Luck with it.

Bob

Posted on Oct 22, 2009

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1 Answer

Code po157


02 sensor circuit low voltage ---answer is copied from obd-codes .com you can visit this site for more information if necessary Usually rear o2 sensor problems won't cause drivability issues since they are an input that measures catalyst efficiency (unlike front o2 sensors). However if you have other codes present, like lean codes or pre-o2 sensor codes, then they may cause drivability problems as well as P0143. The following symptoms may be present: MIL (Malfunction Indicator Lamp) illumination Engine performance issues Engine running rough Engine running rich (only if PCM is trying to add fuel to compensate for low o2 sensor voltage reading) Engine running lean (only if vacuum leak is large enough that PCM can't compensate by adding fuel) Poor idle Causes If you have reason to believe that your engine is running lean, fix that problem first, then clear codes and see if the P0157 code resets. An engine that is running lean could set this code, but usually there will be lean codes (P0171, P0174) present. The following could be causes: Air leaks in exhaust in front of o2 sensor giving false reading Engine running excessively lean O2 sensor connector damaged/corroded O2 sensor signal circuit is shorted to ground O2 sensor ground circuit is open O2 sensor has failed (it may be contaminated with fuel or coolant) PCM has failed

Read more at: http://www.obd-codes.com/p0157
Copyright © OBD-Codes.com

Oct 02, 2013 | 2001 GMC Jimmy

1 Answer

00 bmw 323i chekc engine light is on and it's giving me codes for all 4 O2 sensors i replaced them and light comes on with the same codes when you turn off the car and turn it back on. possible fu


You need to inspect the spark plugs to see i the engine is running lean or rich. I have seen cars set codes or the O2 sensors instead o setting rich/ lean codes.

Dec 12, 2012 | 1999 BMW 323 Series

2 Answers

I have a 97 wrangler 2.5. Check engine light is on, running lean, loss of power and high fuel consumption. I have replaced the o2 sensors, reset check engine code. light stays off and engine runs great for...


Something odd about what you posted. An engine that is running lean shouldn't be using a lot of fuel. Lean is when there isn't enough fuel going into the engine. Two other sensors that regulate fuel flow are the map sensor and throttle position sensor. Temp sensor generally would cause a rich condition but I'd test that too. Be sure to check for vacuum leaks at the manifold and lines as well as fittings... A vacuum leak will give the O2 sensor a lean reading...seeing that, the computer will try to compensate by adding fuel. Clearing codes can change the way it's running but as soon as the computer runs through it's internal diagnostics it will turn the light back on if there is a problem.

Mar 24, 2011 | 1997 Jeep Wrangler

1 Answer

Engine codes run on 2004 Freestar


Make sure you have all the vacuum leaks repaired.
Disconnect the battery for two mins,codes my clear.
The codes you got are O2 Sensors,because of the vacuum leak,which leaned out the readings and set the codes.

May 03, 2010 | 2004 Ford Freestar

1 Answer

Engine running rought at idle won't stay running runs great at higher r.p.m. check eng. light comes on once engine is warmed up.


Take it to Advance Auto or Autozone and they'll read the check engine code. That will give you an idea but it's not perfect. There are many faults that trip the check engine light and I suspect there will be several. Coils or Mass Air Flow sensor would be at the top of my list of suspects. A bS Mass Air Flow sensor will give other codes such as lean or rich or even manifold leak, because the result is the fuel system doesn't provide proper ratio of fuel to air.

Mar 14, 2010 | 1995 Mazda 626

2 Answers

1999 Chevy silverado 5.3 engine setting codes p171 p174 already replaced mas air flow and checked for leaks


oxygen sensor failure
P0171 System too Lean (Bank 1) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
P0174 System too Lean (Bank 2) - Read Our Article On Oxygen Sensor Codes For Help With This Generic Check Engine Light Code
hope this is a bit of a push in the right direction ...

Feb 02, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

Cheek eng, light is on and it is giving a code po134 but the car is run good.


when the ceck engine light is on you will almost never feeel any difference in the way the car feels or runs your code indicates the following

O2 Sensor Circuit No Activity Detected Bank 1 Sensor 1
You should replace the O2 sensor that is in the exhaust manifold or exhaust pipe just off the engine and before the catalytic converter.

Nov 12, 2009 | Dodge Neon Cars & Trucks

2 Answers

Ford 150 runs rough when cold


check the engine for vacuum leaks at the intake manifold, u can do this with a bottle of propane, spray around the intake when it is rough and see if it smooths out, if it does u found the vacuum leak.

Sep 17, 2009 | 2001 Ford F150 Styleside SuperCrew

1 Answer

2000 accent running lean


often its the fuel filter thats beginning to clog,will give lean code,i would chge it.

Mar 19, 2009 | 2000 Hyundai Accent

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