Question about 2006 Volvo XC70

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I had a new exhaust system installed but the message center still reads exhaust system should be checked. I also have my mechanic making sure everything is in proper running order but check engine light won't clear. Is there anything I can do to clear this?

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Check the O2 sensors is what i would do first here ,then go from their

Posted on Mar 20, 2011


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Hello, I have a 2010 BMW X3. Got a P00BC, P0171, and P0174 code. Got MAF sensor changed, but mechanic said when he install the new MAF, he got the same code, so he install my old MAF back.

No mechanic would take an electrical part and install it and then take it back out after it failed to repair the issue. They are supposed to know what part is bad before they do that and he did not use diligence. Unplugging a MAF will not usually kill the engine. IT will produce and error code though. No usually a too lean error.

Jan 03, 2018 | BMW Cars & Trucks

1 Answer

1993 honda accord acts like running out of gas step on gas pedal and it runs ok for about .5 mile does it again

check for plugged exhaust system, it could be that a pipe has collapsed or the catalytic converter may be plugged up. check back pressure at the o2 sensor ( req' special tool) or drill small hole in exhaust system just ahead of the converter and use heavy duty fuel pressure gauge. Reading should be no more than 2 1/2 psi. If pressure is greater install new exhaust system starting w/ converter. If back pressure is ok, check fuel pressure and go by book specks. P.S make sure to weld up hole in exhaust after back pressure test. If converter and rest of exhaust checks out.

Apr 18, 2013 | 1991 Honda Accord

1 Answer

Hot Exhaust, Bogging, and Flashing Check Engine light, diagnostics plug wont allow reading

yes the cat can be installed backwards especially if it is a universal fit style part
take the cat off and run the engine without it next

Jun 30, 2012 | 1999 Chevrolet Blazer

1 Answer

Engine code P2096 for a 2005 Dodge Noen 2.0litre

P2096 is Post Catalyst Fuel Trim System To Lean Bank 1.
In most cases this code refers to a bad O2 sensor in the exhaust. Due to year etc, senor replacement. here is the technical info for the code. Indicating O2 sensor 1/2 meaning bank 1, sensor 2 plus shows other posssibles

If the PCM multiplies short term compensation by long term adaptive as well as a purge fuel multiplier and the result is below a certain value for 30 seconds over two trips, a freeze frame is stored, the MIL illuminates and a trouble code is stored. Two Trip Fault. Three good trips to turn off the MIL.

Exhaust leak
Engine mechanical
1/2 O2 Sensor
(K141) O2 Sensor 1/2 signal circuit
(K299) O2 1/2 Heater control circuit
(K904) O2 Return downstream circuit
Fuel contamination

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See: Initial Inspection and Diagnostic Overview\Initial Inspection


- Check the vehicle repair history. If the 1/2 O2 Sensor has been replaced make sure that the O2 sensor was properly installed and meets OEM specification.
- Check for contaminants that may have damaged the O2 Sensor: contaminated fuel, unapproved silicone, oil and coolant.

Ignition on, engine not running.
With a scan tool, read DTCs.

Q: Is the DTC active at this time?

YES: Go To 2
NO: Refer to the INTERMITTENT CONDITION Diagnostic Procedure. See: Component Tests and General Diagnostics Perform the POWERTRAIN VERIFICATION TEST. See: Verification Tests\Powertrain Verification Test

Turn the ignition off.


Visually and Physically inspect the exhaust system for holes, cracks, and blockage in the exhaust system.

Q: Is the exhaust system is good condition?

YES: Go To 3
NO: Repair or Replace as necessary. Perform the POWERTRAIN VERIFICATION TEST. See: Verification Tests\Powertrain Verification Test

Check for any of the following conditions/mechanical problems.
AIR INDUCTION SYSTEM - must be free from leaks
ENGINE VACUUM - must be at least 13 inches in neutral
ENGINE VALVE TIMING - must be within specifications
ENGINE COMPRESSION - must be within specifications
ENGINE EXHAUST SYSTEM - must be free of any restrictions or leak
ENGINE PCV SYSTEM - must flow freely
TORQUE CONVERTER STALL SPEED - must be within specifications
POWER BRAKE BOOSTER - no internal vacuum leaks
FUEL - must be free of contamination
FUEL INJECTOR - plugged or restricted injector; control wire not connected to correct injector

Left side exhaust, 2nd O2 sensor back just after cat converter


- Raise and support vehicle.
- Disconnect wire connector from O2S sensor.

CAUTION: When disconnecting sensor electrical connector, do not pull directly on wire going into sensor.

- Remove O2S sensor with an oxygen sensor removal and installation tool.
- Clean threads in exhaust pipe using appropriate tap.

Threads of new oxygen sensors are factory coated with anti-seize compound to aid in removal. DO NOT add any additional anti-seize compound to threads of a new oxygen sensor.

Install O2S sensor. Tighten to 30 N-m (22 ft. lbs.) torque .
Connect O2S sensor wire connector.
Lower vehicle.

Hope this helps and just keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa.

Nov 01, 2011 | 2005 Dodge Neon

1 Answer

Message Warning - Tire Pressure System Maintenance Required - Does this mean a sensor is out as I have checked tire pressure to ensure 34 lbs. pressure in each?

If you've had the tires rotated or installed new tires recently they may have installed the wrong wheel in the wrong location. This can cause false readings from the tire pressure sensor readings. Make sure the wheels are in the proper position on the vehicle.

Mar 23, 2011 | 2001 Volvo S60

1 Answer

Where are the exhaust system bolts located?

Removal & Installation 2.2L Engine To Remove:
  1. Remove or disconnect the following:
    • Negative battery cable.
    • Heat shield.
    • Oxygen sensor.
  2. Raise and safely support the vehicle.
  3. Remove exhaust pipe from the exhaust manifold.
  4. Lower the vehicle.
  5. Remove the exhaust manifold mounting nuts from the cylinder head. chevy_cav_02-04_exmanifold.gif

  6. Remove the exhaust manifold.
  7. Clean the mating surfaces.
  8. Check for cracks, broken flanges and gasket surface damage.
  9. Use a straight edge and a feeler gauge. If the flanges or the mating surfaces do not align, the manifold is warped and should be replaced.
To Install:
NOTE: The manufacturer recommends using new exhaust system nuts.
  1. Install the manifold gasket.
  2. Position the exhaust manifold to the cylinder head. Exhaust manifold 2.2L 87953055.gif

  3. Install the new exhaust manifold nuts. Tighten the nuts starting from the center and working toward the ends to 110 in lbs (12.5 Nm).
  4. Raise and safely support the vehicle.
  5. Install the exhaust pipe to the manifold using a new flex coupler gasket.
  6. Install new exhaust flange mounting nuts.
    • Tighten to 33 ft lbs (45 Nm).
  7. Lower the vehicle.
  8. Install the oxygen sensor.
  9. Install the heat shield.
  10. Connect the negative battery cable.
2.4L Engine To Remove:
  1. Disconnect the negative battery cable
  2. Disconnect the Oxygen (O2) sensor electrical connector.
  3. Remove the (O2) sensor.
  4. Raise and safely support the vehicle. Exhaust brace 2.4L 87953053.gif

  5. Remove the exhaust manifold brace-to-manifold bolt and the oil pan nuts, if necessary. Exhaust heat shield 2.4L 87953051.gif

  6. Remove the upper heat shield. NOTE: Do NOT bend the exhaust flex decoupler more than necessary to remove it. Excessive movement will damage the flex decoupler
    Exhaust flex decoupler 87953056.gif

  7. Remove the manifold-to-exhaust flex decoupler fasteners.
  8. Remove the exhaust pipe.
  9. Carefully lower the vehicle.
  10. Remove the exhaust manifold-to-cylinder head mounting nuts/bolts. Remove the exhaust manifold.
  11. Discard the gaskets and/or seals. Clean the mating surfaces.
To Install:
Exhaust manifold 2.4L 87953055.gif

  1. Install new exhaust manifold gaskets. Position the exhaust manifold on the cylinder head. Tighten the mounting bolts in sequence to 110 in lbs (12.5 Nm).
  2. Raise and safely support the vehicle.
  3. Install the exhaust manifold heat shield. Tighten the mounting bolts to 10 ft. lbs (14 Nm).
  4. Install the exhaust manifold brace-to-manifold bolt and the oil pan nuts. Tighten the mounting bolts to 41 ft lbs (56 Nm) and the nuts to 18 ft lbs (24 Nm).
  5. Position the exhaust pipe to the manifold. Install the manifold-to-flex decoupler mounting bolts. Tighten to 26 ft lbs (35 Nm).
  6. Lower the vehicle.
  7. Coat the threads with a suitable anti-seize compound and install the O2 sensor.
  8. Connect the O2 sensor electrical connector.
  9. Connect the battery ground cable and check for leaks.
prev.gif next.gif

Sep 02, 2010 | 2000 Oldsmobile Alero

1 Answer

How hard is it to change the head?

It depends upon your level of mechanical knowledge. The first thing you will need is a good set of hand tools and the buy or borrow a repair manual for your car. I can give you a basic idea of what's involved but you will need a repair manual because there are torque values and timing marks that will need to be checked. You will have to remove all coolant from the engine, then remove your timing cover and timing belt, make sure your timing is at TDC (top dead center) before removing belt. You'll have to recheck anyway but it's always good to have your crankshaft in the proper position upon installation. Remove the valve cover, intake manifold, exhaust manifold, any electrical connectors, hoses or lines attached to the head Loosen and remove your cylinder head retaining bolts in sequence (this is where your manual starts coming in handy) then remove your head. Before reassembling everything make sure you have your head checked by a automotive machine shop for cracks and warpage. Now reassembly is in reverse of teardown BUT you will need to reference you manual for the proper torque values and installation steps when assembling the head and various components. I can't stress this enough. If you've never done it before it wouldn't hurt to have someone there to assist you that has. Make sure before starting you read the whole procedure in your manual so that you are familiar with the steps involved. Hope this helps, good luck.

Nov 03, 2009 | 1994 Hyundai Excel

1 Answer

I need the timing marks for a 1999 ford escort ZX2 2.0L DOHC

NOTE: Make sure the correct (second) notch in the pulley is indexed to the lower cylinder block (6010).
Position the crankshaft (6303) just prior to top dead center. Install the Camshaft Alignment Timing Tool on the back of the camshafts. fcdabeb.gif
  1. NOTE: Make sure the correct (second) notch in the pulley is indexed to the lower cylinder block (6010).
    Position the crankshaft (6303) just prior to top dead center.

2.Remove the bolt and install the top dead center timing peg
3 Rotate the crankshaft clockwise against the peg.
5332a96.gif NOTE: Installation of the alignment tool into the exhaust camshaft (6250) may require the camshaft to be rotated clockwise.
Install the Camshaft Alignment Timing Tool on the back of the camshafts. 9e76853.gif
  1. Install the intake timing sprocket and loosely install the bolt.
  1. Rotate the oil control bushing one full turn and inspect for binding. Position the bushing with the single hole in the 12 o'clock position.
  2. f7eb1fd.gif
    1. Install a new exhaust sprocket O-ring into the exhaust sprocket.
    1. Install the exhaust camshaft sprocket. Make sure that the tab on the sprocket engages the hole previously positioned at 12 o'clock in the oil control solenoid bushing.
      • Loosely install the bolt.
      • 73bc433.gif
    1. Loosely install the timing chain tensioner.
    1. Install the timing belt.
    2. 9406c65.gifEngage the timing belt tensioner tab into the upper timing cover backplate. a1cb4c6.gif
      Using a 6 mm Allen wrench, adjust the timing belt tensioner until the index marks are aligned. Tighten the bolt
    1. sxf~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: The camshaft must be held stationary with an open-end wrench. Do not use the alignment tool to hold the camshaft in position or damage to the camshaft may occur.
      Tighten the bolt on the intake camshaft sprocket.
    2. 25f34cb.gif
    1. sxf~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: The camshaft must be held stationary with an open-end wrench. Do not use the alignment tool to hold the camshaft in position or damage to the camshaft may occur.
      Tighten the bolt on the exhaust camshaft sprocket in three steps.
      • Tighten the bolt to 50 Nm (36 lb-ft).
      • Remove the TDC peg and Camshaft Alignment Timing Tool.
      • Tighten the bolt to 115-125 Nm (85-92 lb-ft).
      • 24c43e7.gif
      Install the VCT oil plug.c96f65a.gif
    1. NOTE: Make sure the correct (second) notch in the pulley is indexed to the lower cylinder block.
      Position the crankshaft just prior to top dead center.
    2. 993d4ea.gifRemove the bolt and install the TDC peg. Rotate the crankshaft clockwise against the peg. NOTE: Installation of the alignment tool into the exhaust camshaft may require the camshaft to be rotated clockwise. If the alignment tool does not align and install in the camshafts, repeat Steps 1 through 17.
      Install the Camshaft Alignment Timing Tool on the back of the camshafts.
      1. Remove the alignment tool and TDC timing peg.
      1. Install the bolt. 5332a96.gif

    Oct 24, 2009 | 1999 Ford Escort

    1 Answer

    How to remove 1988 honda accord exhaust system????

    you will always want to make sure the exhaust system is cooled down. some simple guidelines are to start from the back and work your way forward. use some type of penetrating oil (WD-40, etc...) on the fasteners to make the removal easier. make sure you use new hangers, clamps and gaskets when installing your new exhaust. use anti seize compound on the threads, and make sure you get proper clearance to keep from damaging the interior due to overheating. Best of Luck!

    Sep 24, 2009 | 1988 Honda Accord 4 Door

    1 Answer

    PO420 Catalyst System Efficiency below threshold.

    Basically the mechanic will make sure don't need a tune up. or have vacuum issues or leakes in the exhaust before the cat. Then he should check the front 02 sensor to make sure its not getting lazy. If all this passes then you will need a new cat. If the O2 sensor has more than 70,000 miles on it it needs to be replaced anyways so you may just want to do this first and hope the light stays off.. The problem with a lean code is you will wear out the cat real fast if you didnt deal with this and kept driving the car. The lean code could have been vacuum leak or a bad MAF sensor or weak fuel pump.

    Sep 02, 2009 | 1999 Mercury Mystique

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