Question about 1998 Ford Mustang

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98 Mustang 3.8 too lean + catalytic convecter smoking

Bank 1 and 2 are too lean .
I checked the spark plug gaps and tighted them. And another problem is the catalytic is smoking after a hour on the highway. I'd like to fix the problem without much trouble.

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The lean condition would be caused by a vacum leak or lower intake gasket leak.

Posted on Mar 10, 2009

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1 Answer

Engine light on and misfiring and want to fix this and get it running smooth


The cylinder misfires cause lean or rich
fuel trim

A constant lean on fuel trim, is a rich condition
driven lean by pcm to correct

If two cylinder are affected & are together or maybe
not ,then smoke the intake for vacuum leaks

A leaking injector is obviously a rich senerio

Converter only works with the O2 Sesnors to report
back the rich or lean to pcm

You need to get rid of the misfires before any fuel control
returns to normal

Mar 08, 2013 | Cars & Trucks

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We have a 98 for mustang v6 3.6 liter engine. the check engine light came on and gave us the code p1131..i have searched the internet for possible solutions but want to know if any one experienced this to...


P1131 - Insufficent Switching 02 Bank 1 Sensor - 1 Sensor / Lean.

Sensor 1 on bank 1 is the passenger's side upstream 02 sensor.

Start by cleaning the MAS and Filter and see if this helps. If not, you will probably need to replace the O2 sensor.

It COULD also be a bad No.2 injector I believe

Jul 05, 2011 | 1998 Ford Mustang

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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

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What does code P1151 mean when it is thrown on a 97 mustang GT with a 4.6 motor


Ford P1151 = Lack of heated oxygen sensor bank 2, sensor 1 switches, sensor indicates lean.

The oxygen sensor that is upstream of the catalytic converter on the exhaust side that covers the bank of cylinders that includes cylinder no. 2 (the even bank) is not switching rapidly enough from lean to rich. It is "stuck" on lean mode. It could be tested for proper operation and if it fails the tests, it should be replaced.

Mar 04, 2011 | Ford Mustang Cars & Trucks

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I have a oo ford lightning. when hauling after a while it overheats. replaced spark plugs, water pump, coolant, oil, i thought it was the catalytic conv. that it may be plugged but it runs fine i checked...


Pressure test your system and ensure you dont have any coolant leaks. As for your lean/rich codes. Check that your fuel pressure is correct if not, then try a fuel filter, if problem persists then maybe a fuel pump. But before doing something extreme such as your fuel pump, check for air intake leaks. The best and easiest way to do it is use a smoke machine and look for smoke escaping. Might want to replace your thermostat also for your truck. If its stuck closed then it wont allow the coolant to cycle properly. I dont really have a lot to go on with your description, but i hope some of this helps.

Nov 03, 2010 | Ford SVT Cars & Trucks

1 Answer

2006 hundai elantra P2270 code. If this is an O2 sensor, which one?


Possible O2 sensors:

P2270 O2 Sensor Signal Stuck Lean Bank 1 Sensor 2
P2271 O2 Sensor Signal Stuck Rich Bank 1 Sensor 2
P2272 O2 Sensor Signal Stuck Lean Bank 2 Sensor 2
P2273 O2 Sensor Signal Stuck Rich Bank 2 Sensor 2
P2274 O2 Sensor Signal Stuck Lean Bank 1 Sensor 3
P2275 O2 Sensor Signal Stuck Rich Bank 1 Sensor 3
P2276 O2 Sensor Signal Stuck Lean Bank 2 Sensor 3
P2277 O2 Sensor Signal Stuck Rich Bank 2 Sensor 3
P2278 O2 Sensor Signals Swapped Bank 1 Sensor 3 / Bank 2 Sensor 3
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This is Bank 1 (closer to the dash panel) Sensor 2 (located after the catalytic converter).

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Note: A malfunctioning front oxygen sensor may cause fuel trim codes to set.
  1. Several Diagnostic Trouble Codes use specific terminology to refer to sensor location. The illustration and key below explain the following terms:
  2. Engine BANK Bank 1 is closer to the dash panel, (also referred to as RH or right hand). Bank 2 is closer to the radiator, (also referred to as LH or left hand).
  3. UP Refers to Sensor 1 or "front sensor". It is located closer to the exhaust manifold and before the catalytic converter.
  4. DOWN Refers to Sensor 2 or "rear sensor." It is located after the catalytic converter.
  5. The following examples show how to interpret oxygen sensor terminology:
  6. B1/S1 = Bank 1/Sensor 1 = Dash panel side, BEFORE the catalyst or "upstream"
  7. B2/S2 = Bank 2/Sensor 2 = Radiator side, AFTER the catalyst or "downstream"

Aug 06, 2010 | Hyundai Elantra Cars & Trucks

1 Answer

2000 lincoln navigator unable to bleed up fuel


I think I would try the easiest thing to fix and then see how much straightened out. The fuel tank vacuum will probably be a gas cap not on tight or defective or a gas vapor line has a hole in it. You may need a smoker to find that leak if the gascap is okay,

Bank 1 should have cylinders 1,2,3,4. Since 3 cylinders that are in the same bank are misfiring it must be lack of fuel or bad spark. The tester said that bank was lean. If the plugs were not firing it would be rich with unburned fuel. The tester also indicated the other fuel tank vacuum bleed problem.

You might try the power connector for the Bank 1 injectors or check the injector wiring for #2,3,and 4 to see if they are getting power.

Remember to clear the diagnostic meter to see if the trouble codes return. Would be interested in the outcome.

Apr 19, 2010 | 2000 Lincoln Navigator

1 Answer

PO171


P0171 - Fuel Trim System Lean Bank 1
YOU WILL NEED TO AVE THE DEALER TEST THE O2 SENSOR FOR PROPER SWITCHING, RIGHT NOW IT SHOWS ALWAYS LEAN, THIS MAY BE THE SENSOR OR THE ENGINE MAY REALLY BE LEAN ON FUEL AIR RATIO, AS FAR AS THE SMOKE GOES THE 2 ARE PROBABLY NOT RELATED, HOW MANY MILES ON CAR? IF THE MILES ARE HIGH THEN REPLACE THE O2 SENSOR ON THE CYLINDER BANK WHERE # 1 CYLINDER IS LOCATED, THE SENSOR IS THE ONE BEFORE THE CATALYTIC CONVERTER.

May 08, 2009 | 2000 Chevrolet Monte Carlo

1 Answer

1999 vw jetta 2.0


Sounds like two problems. P0300 and P0303 are possibly spark plugs. They could be a coil pack but I'm leaning toward a spark plug problem because of the other two codes - they're indicating O2 sensor problems. If the O2 sensors are screwed up, the car reverts to preprogrammed, rich fuel maps that send excessive fuel through the engine. The reasoning is, if the ECU can't trust the O2 sensors to determine how much fuel to burn optimally, it'll pump a bunch of extra fuel through the engine to keep it safe. Having too little fuel (aka running lean) can destroy an engine, so the ECU plays it safe and runs rich (too much fuel) instead. The consequences of rich running are relatively minor compared to lean running, but can and do tend to create excessive carbon buildup on the catalytic converter and O2 sensors, as well as fouling spark plugs.

First thing to do though is to swap the wires on your coil packs and see if you end up with a misfire code for the same cylinder #3. If you do, then it's the plug or wire. If it moves, it's the coilpack. Replace whichever part is faulty. You'll probably need oxygen sensors too, before you can clear all the codes.

Aug 27, 2008 | 1999 Volkswagen Jetta

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