Question about 2002 Mercury Mountaineer

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1997 mountaineer check engine light on again have already replaced all o2 sensors egr valve and a pressure something light kept comming on finally went out almost 400 miles later it has come back on

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Assuming everything you replaced was bad,and I doubt it,you would have had a different code for each item you replaced!

What code do you have now?

It sounds as though,your replacing the parts, that are the symptom ,e.g. codes,not finding the cause or problem ,that set them.

Posted on May 16, 2010


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2000 Mercury Mountaineer 5.0L dumping gas into intake manifold and detonation in exhaust manifold on exhaust firing cycle

Fuel pressure regulator bad. Vacuum operated , pull the vacuum line. Smells like fuel. It's bad .Electronic could a fuel pressure sensor on the fuel rail or the fuel pump control module.

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Car has power loss, hestitant to start and rough idling

Connect to a live OBD2 reader and see if the O2 sensors jump a lot If so they are fine. If they read 0 or something constant, change. Check EGR could be stuck. Replace as needed.

Hook up a manual gauge to the fuel and check the pressure. All cars are different but it should be somewhere around 50psi. See if the car hold pressure for about 10 minutes. Replace the fuel filter as well.

Dec 10, 2013 | 1999 Mercury Mountaineer

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Engine light on, vehicle usually won't start. engine light code is o2 sensor

The oxygen sensor won't stop it from cranking or starting

Check for spark or injector pulse when cranking

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Dec 08, 2012 | 2000 Mercury Mountaineer

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I have a 1998 ford escort with a check engine light on and can't get it off

Here is a list of possible causes. Some things you have already done.

EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
- EGR volume control valve stuck closed
- Faulty EGR Pressure sensor
- Faulty EGR temperature sensor and circuit
- Faulty EGR Valve
- EGR passage clogged
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Oct 07, 2012 | 1998 Ford Escort

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Went to get emissions done and my service engine light was on. Expectedly car failed. He told me I had to have Bank 2 senor 2 replaced and Bank one Sensor one replaced. Well I replaced the senors but...

Go to the nearest Autozone and do again a code scanning.If the code is reporting lean or rich mixture from O2 sensors, then the problem are not the sensors but something else.

Lean sensor is often caused by vacuum leak. Rich may be given by a defective sensor in air intake or by other causes, like an EGR valve stuck open. Check also fuel pressure to ensure that pump and pressure regulator are OK.

Jul 08, 2011 | Chrysler Sebring Cars & Trucks

1 Answer

Can't pass state inspection, changed EGR valve already, next?

I suggest quit hunting for maybes and rent an OBD code reader which ends up being free when you return it to the auto parts store. Connect it and find out what is causing the CEL condition. Normal issues are the O2 sensor, or sensors in the system.

Jul 20, 2009 | 1997 Mercury Sable

1 Answer

Check engine light on 1997 Honda accord EX


If the engine is running without any problems then The fault code which has flagged the checked engine light will either pertain to the upstream O2 sensor, a drop in catalytic efficiency, an EGR issue, or maybe even an EVAP issue.

A lot of EVAP issues can be resolved by simply ensuring that the fuel filler cap is on securely, otherwise a vacuum leak will be detected in the system and the check engine light will come on.

A drop in catalytic efficiency (P0420) is usually temporary and will stay away after a reset.

EGR issues can sometimes be rectified by removing the EGR valve and cleaning it, and the ports on the intake where it was sat, but there are occasions when it has to be renewed.

The O2 sensor issues are a wee bit different. There are a number of fault codes which relate to the O2 sensor, and which make the O2 sensor look faulty, when the O2 sensor is actually attempting to rectify a problem from elsewhere and isn't faulty at all. However, they could also be due to a fault with the O2 sensor. Basically, further checks should be made before condemning the O2 sensor should the fault code relate to the sensor.

Have a code read done and then have the codes reset and see what comes up.



Jun 23, 2008 | 1997 Honda Accord

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