MERCURY MARQUIS P CODES (POWERTRAIN) P0400 - P0499

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P0420 P0430

PO420 On 2000 Grand Marquis

I Recently Had The Po 420 Code Show Up On My Grand Marquis. I've Replaced The Downstream O2 Sensor On Bank One. It Didn't Fix The Problem...

Asked by gnorton52 ·

1 ANSWER

2000

MERCURY MARQUIS

Is it Safe to Drive Check Engine Light?

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Is it Safe to Drive Check Engine Light?

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Check Engine Light

Check Engine Light

Why is my check engine or service engine soon turned on? In this guide we talk about what this is associated with this notorious light, what it is used for and what you...

1998 Mercury Marquis Diagnostic Code P0430

Code P0430 Keeps Engine Light On All The Time. Have Been Told By Others It Is A Bad Ox Sensor And Won't Do Any Harm. Is This True? And...

Asked by Eric M ·

1 ANSWER

1998

MERCURY MARQUIS

2000 Mercury Marquis P0430 Code

It Started As Codes P0305, P0307. Misfires On Cylinders 5 And 7. I Purchased New Coil Packs For The Two Cylinders And New Plugs For All 8...

Asked by roughouthere ·

1 ANSWER

2000

MERCURY MARQUIS

2001 Mercury Marquis Engine Code For Possible Bad Cat...

The Check Engine Light Is On, My Scanner Shows A Code Of P0430 Which Indicates A Possible Bad Catalytic Converter Or A Bad O2 Sensor. Don't...

Asked by hydroguy ·

1 ANSWER

2001

MERCURY MARQUIS

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