Question about 2000 Pontiac Montana

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My 2000 pontiac montana wont start,it just turns over,both oxygen sensors are shot and the egr valve is stuck closed,which one would be the main problem

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The EGR will not open at idle or when cold, so if it is stuck closed this will not affect anything. If the O2 sensors are reporting 'too rich' (not enough oxygen) signals, the ECU will respond by leaning to fuel injection cycle to the point that there is not enough fuel to start.

How to check? An issue with oxygen sensors is that they steadily lose effectiveness with age and they can under perform for quite a while before they trigger an error code on the ECU. Ensure the connection to the oxygen sensor is robust and clean. As the oxygen sensor only works when hot (they have their own in-built heaters, hence two wires for heating and two wires for sensor operation) and so there is the danger of getting burnt by working on them so a safe approach is to find the electrical connection on the wiring harness remote from the oxygen sensor and to make voltage measurements there. Most garages have systems that can record the amplitude and frequency of the voltage peaks being produced by the oxygen sensor. A less sophisticated means to get some impression of the oxygen sensor function is to use a moving coil galvanometer type voltmeter (analogue needle on dial). Setting the voltage range to 1 volt and by attaching the meter leads across the sensor wires it should be possible to see the rhythmic pulsing and the voltage range of the operating sensor output. If no pulses are seen it could be either a break in the wire or a fault with the sensor itself.

Your vehicle is about 10 years old and most oxygen sensors last about 10 years or 100,000 miles....check to see how easy they are to get at and what the price is for replacement before contemplating replacing them

Posted on Nov 11, 2010

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Egr valve stuck, need to replace that, the car will run with bad o2 sensors

Posted on Nov 11, 2010

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  • Pontiac Master
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O2 sensor won't keep it from running,EGR closed won't either ,it's something else.Take off the fuel cap,have someone listen at the fuel filler when you turn the key on,should hear the fuel pump run for about 3 seconds.
If it doesn't ,we go on from here.
If it does ,check for spark

Posted on Nov 11, 2010

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1 Answer

2000 Pontiac Montana sets a P0138 AFTER replacing the post-converter oxygen sensor and cat. The scan tool finds 1.105V with the sensor connected (this is the same voltage that the old one produced) a


code po138 refers to heated oxygen sensor (HO2S) 2 bank 1 high voltage ===causes wiring short to positive---HO2S---ECM
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Both sensors are suffering from a short to positive situation so Check the wiring for shorts from burnt wiring (against exhaust system or wires twisted and pulled together in the connections or sensors ( from using the incorrect spanner) to remove/ replace the sensors and damaging the wires

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It may but there are other sensors that will affect the idle performance.. Run fault codes first. Check the condition of the PCV valve and the EGR valve.

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Where on the 2000 Pontiac Montana is the EGR valve located


Its located between the throttle body and the firewall. It bolts onto the upper intake.

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one long flash and two short flashed means the ECM is working fine
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Hi. I understand I need to replace my EGR valve on a Pontiac Montana, 2000. (3.4 L) Any tips or guides on just how one gets to this valve? (behind air intake assembly)


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1 Answer

OBDII SETS CODES P0401, P0171 & P0174 . 1998 Mercury Sable


P0401- Exhaust Gas Recirculation Flow Insufficient Dectected
Possible causes - Harness or connectors (EGR volume control valve circuit is open or shorted.)
- EGR volume control valve stuck closed
- EGR volume control solenoid valve
- Dead (Weak) battery
- EGR passage clogged
- Exhaust gas leaks Possible solution - Clean EGR Valve
- Repair EGR harness or connector
- Replaced EGR volume control solenoid valve
- Replaced EGR volume control valve
Code P0171- Fuel Injection System Too Lean Bank 1 Possible causes - Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem P0174- Fuel Injection System Too Lean Bank 2 Possible causes - Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem.

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