Question about 2002 Chevrolet Monte Carlo

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Running lean check engine test came out, running lean. they cleaned the sensor but happened again. now can hardly drive it. took it in for the weekend to replace with new sensor.. could another serious problem be the case with the running lean code?

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Check fuel pressure and vacume leak arond intake /tbi

Posted on Jul 27, 2009

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I get code 51 on 1996 dodge caravan....fuel system lean---a lean air/fuel mixture has been indicated by an abnormally rich correction factor. The van runs fine when engine is cold but will sputter and...


the code is telling you where the problem is. Try replacing the HO2S sensors as the cpu is having trouble keeping the air /fuel mixture within limits. Check the cat converter for cracks or blockages . Have a pressure test done on the fuel manifold to check for pump/filter and pressure regulator problems. Check the ambient air temp sensor and coolant temp sensor as they also affect the air/fuel mixture.

Sep 23, 2013 | 1996 Dodge Caravan

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Toyota Corolla Code P0171 Check Engine light


Code P0171 on Toyota Corolla Q: What could cause the code P0171 on 2002 Toyota Corolla? A: The code P0171 reads "System Too Lean (Bank 1)". This means that the air-fuel mixture coming in to the engine is too lean, or there is too much air and too little fuel. This could be caused by a number of reasons, such as bad airflow sensor, vacuum leaks, low fuel pressure, clogged fuel injectors, etc. To know exactly what caused the problem, your mechanic can do a few tests.
From my experience, the airflow sensor problems are fairly common; sometimes the sensor just gets dirty and gives false air flow readings causing lean condition. Again, your mechanic can test it.
If the airflow sensor is causing the lean condition, it will need to be replaced. If the sensor is just dirty, your mechanic may suggest to clean it (cleaning the airflow sensor is very delicate procedure) as a temporary solution - sometimes this could work.

on Dec 07, 2009 | Toyota Corolla Cars & Trucks

1 Answer

1985 toyota 4runner running too lean


Maybe it's not running lean. Maybe it's misfiring. Since you put in new fuel parts and that didn't help, maybe there is an ignition component that fails when it gets hot. A bad coil can do this, also the igniter-rarely, admittedly, but you could have it tested. When it stalls and won't start, if you check for spark and find none, it would confirm an ignition problem.
I hope you find it. Post back and let us know.

Jul 29, 2012 | Toyota Cars & Trucks

1 Answer

I have a 1999 chevy malibu - 45000 mi. Took to auto zone for computer reading and replaced O2 sensor that the dealer replaced with the fuel filter. about 145 miles while accelerating up a moderate hill...


The 02 sensor is detecting a malfunction in the emissions. That would be from a bad fuel mixture, too rich or too lean caused by dirty or faulty injectors or MAF sensor. A clogged catalytic converter will also cause it. Connect a manual fuel gauge to the fuel rail and test your fuel presuure. Test your fuel pressure regulator, the fuel pressure should increase 5-10 pounds when you disconnect the regulator...if it don't, the regulator is bad...Check for vacuum leaks and stuck or dirty egr valve. This would cause a lean condition. Check your air filter. Good luck, i hope this helps.

Jul 17, 2011 | 1999 Chevrolet Malibu

1 Answer

Engine light came on took it to auto shop. they said it was a code 51


Fault Code 51 - Oxygen sensor output indicates lean too long

Power loss light: Off
Limp-in mode: Engine allowed to run rich, but prevented from running lean

Possible Causes
Bad oxygen sensor - Replace the sensor which is located on the turbo housing near the down pipe (for turbo) or on the down pipe near the exhaust manifold.

Bad connection or wiring - Check the wiring and connections between the sensor and the logic module (or SMEC). Clean and regrease any corroded connectors with dielectric grease and repair any shorts. Look for melted wire insulation near the exhaust manifold. A shorted connection to ground or any positive source will cause this fault code.

Low fuel rail pressure - See the Diagnosing Your Fuel System page.

Diagnostic Method - Trigger Parameters
- In closed-loop
- Sensor output indicates lean for more than 715 seconds (11 minutes, 55 seconds)

Results If Component Fails
A fault code 51 is stored, the circuit stays in closed-loop, and the logic module will still monitor the oxygen sensor signal. If the condition persists for four times what it took to set the code, the logic module will allow the engine to run rich, but prevent it from running lean.

Hope helps.

Mar 28, 2011 | 1996 Dodge Intrepid

1 Answer

2006 Chevrolet impala lean code issue


Unplug the sensor harness and re-connect a and c terminals using jumper wires. You should see about 4.5volts or a bit more from the center terminal (meter(+) to terminal, other lead to good ground. Do this with key on, engine off.. With engine running, (same hookup) You should see a different and varying reading that changes with rpm. Before testing check the vacuum hose going to the sensor to make sure it's intact and has vacuum or test will be invalid. Test procedure I outlined is the last one I remember. Possible GM changed procedure, so best to check a manual if readings are different than what I stated. There are other items that can change mixture but I have seen this a few times. Otherwise, you will need to go through system item by item before finding anything.

Aug 28, 2009 | 2006 Chevrolet Impala

3 Answers

99 RX300 Engine code keeps coming up lean


Check for vacuum leaks. ie, vacuum lines them selves, the rubber tube that runs from the air filter to the throttle body. If it has a plastic intake manifold, possibly the rubber port seal gaskets between it and the engine. Lean codes are set when the PCM isn't monitoring all the air coming into the engine (vac leak) or low fuel pressure.

Jun 24, 2009 | 2001 Lexus RX 300

2 Answers

Engine light on 2002 mazda protege is on even after changing o2


Try cleaning the Mass Airflow (MAF) Sensor. My 2002 Protege check engine light came on and it started stalling at stoplights if I didn't keep the engine revved a little. Manager at AutoZone checked the computer code for the light (P0171?), and it said it was running lean. He suggested I try the MAF sensor cleaner they have ($6.99) rather than replacing the 02 sensor, etc.; it made a *significant* difference. (I think I need to do it again to get it totally cleaned out, but the can is for at least 4 cleanings.) The MAF sensor is the large component that air goes through right after the air filter. If you don't have the repair manual for the car (search online for PDF's), you search for the part online to see what it looks like. Mainly, it's a tube about 4" across with some small wire things inside. The cleaner can said it was a 10 minute job; mine took 20 minutes, but only because the tube leading from the MAF sensor to whatever is next (a kind of bent elbow tube, with a couple of accordian-style ripples) tore, and I had to duct-tape that up to seal it. (Still haven't gotten that replaced - found them online for ~$40. Maybe this weekend...)

Apr 01, 2009 | 2002 Mazda Protege

3 Answers

1998 FORD EXPLORER 4X2 SPORT 4.0 OHV


Check for engine vacuum leaks, use a can of carburetor spray and spray around the top of the engine, pay close attention to the intake manifold, if there is a leak the engine will speed up a little, also the MAF may be defective, cleaning it does not always fix the issue, which is the heated sensor wire no sending the correct signal. My knowledge base? Ford certified Master electronics technician.

Dec 12, 2008 | 2003 Ford Explorer Sport

2 Answers

96 dodge grand caravan help me please


Check MAP sensor. If PCM gets wrong data from MAP sensor it should offset ignition timing and/or make fuel mixture too lean or too rich.

Nov 05, 2008 | 1996 Dodge Grand Caravan

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