Question about Mercury Villager

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Code p0301 misfire cylinder#1 and O2 sensor B1-S1 show all times. I replace both O2, all wires, spark plaugs, Knock senso, crank sensor, distributor and injetor #1 it still shake and show misfire on cyl# and O2 B1-S1. What else?

Posted by Anonymous on

  • Mike Butler
    Mike Butler May 23, 2011

    Have you tested fuel pressure with a gauge to make sure it's up to spec?

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2 Answers

Have you Smoke Tested the intake manifold for
vacuum leaks

Spark Plugs -I would only replace at 70,000 miles

Wires I never replace, unless I see ignition issues
on a scope trace

Knock Sensor - for a misfire

Crank Sensor- Not Scoped, you wasted your time
and learned nothing

Injectors-Seldom Fail,your just guessing,wishing & hoping

The idea is to study all vehicle components and learn how to
test them

NOTHING EVER gets replaced until you can prove that a
part failed. Even if it did and solved the problems your having,
you learned nothing about the parts you replaced

Posted on May 23, 2011

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  • Mercury Master
  • 8,836 Answers

Here is the o2 sensor diagram.
code p0301 misfire cylinder#1 and O2 sensor B1-S1 - jturcotte_1753.gif

Posted on May 23, 2011

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1 Answer

Engine misfire and knock sensor bank 1 codes on 1999 Nissan frontier 3.3 v6


I would want to see the actual codes, but if it is one or two cylinders you could have a failing injector and it not show up as a trouble code.
If one of the injectors is failing it can have a high resistance and affect the other injectors in that circuit.
The O2 sensors and cat would not affect a power loss in one or two cylinders, and the O2 sensor codes would be present.
The knock sensor only measures vibration, so it was probably ok before you replaced it.
There is a chance the cap is shorting out internally which would be tough to see, and the optic sensor in the bottom of the distributor could be causing problems too. Some of the cylinders may not be firing when you think they are.

Sep 21, 2012 | 1999 Nissan Frontier

1 Answer

Failed emissions got p0301,p0402 please help


V6 or 4cyl????
P0301- #1 cylinder misfire -Old/Fouled Plugs -Faulty spark plug wires/distributor or rotor (4cylinder only) -Faulty cam/crank sensor (v6 only) -Faulty #1 ignition coil or coil electrical connector (V6 only) -#1 Compression loss
P0402- EGR Issue A code P0402 most likely means one or more of the following has happened:
  • The DPFE (differential pressure) sensor is faulty and needs to be replaced
  • There is a blockage in the EGR (most likely carbon buildup)
  • The EGR valve is faulty
  • The EGR valve may not be opening due to a lack of vacuum

Jun 07, 2011 | 1996 Toyota Camry

2 Answers

05 kia amanti with diagnostics codes p0350,p0320,p0300,p0302,p0303,p0304,p0305,p0306.skipping at times.when it does skip & misfire the rpm gauge goes crazy.this problem is not consitant


Generic OBD II Diagnostic Trouble Codes

DTC CODES P0300 to P0399

P0300....Random/Multiple Cylinder Misfire Detected

P0301....Cylinder 1 Misfire Detected

P0302....Cylinder 2 Misfire Detected

P0303....Cylinder 3 Misfire Detected

P0304....Cylinder 4 Misfire Detected

P0305....Cylinder 5 Misfire Detected

P0306....Cylinder 6 Misfire Detected

P0307....Cylinder 7 Misfire Detected

P0308....Cylinder 8 Misfire Detected

P0309....Cylinder 9 Misfire Detected

P0310....Cylinder 10....Misfire Detected

P0311....Cylinder 11 Misfire Detected

P0312....Cylinder 12 Misfire Detected

P0313....Misfire Detected with Low Fuel

P0314....Single Cylinder Misfire (Cylinder not Specified)

P0320....Ignition/Distributor Engine Speed Input Circuit

P0321....Ignition/Distributor Engine Speed Input Circuit Range/Performance

P0322....Ignition/Distributor Engine Speed Input Circuit No Signal

P0323....Ignition/Distributor Engine Speed Input Circuit Intermittent

P0324....Knock Control System Error

P0325....Knock Sensor 1 Circuit (Bank 1 or Single Sensor)

P0326....Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)

P0327....Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

P0328....Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

P0329....Knock Sensor 1 Circuit Input Intermittent (Bank 1 or Single Sensor)

P0330....Knock Sensor 2 Circuit (Bank 2)

P0331....Knock Sensor 2 Circuit Range/Performance (Bank 2)

P0332....Knock Sensor 2 Circuit Low Input (Bank 2)

P0333....Knock Sensor 2 Circuit High Input (Bank 2)

P0334....Knock Sensor 2 Circuit Input Intermittent (Bank 2)

P0335....Crankshaft Position Sensor A Circuit

P0336....Crankshaft Position Sensor A Circuit Range/Performance

P0337....Crankshaft Position Sensor A Circuit Low Input

P0338....Crankshaft Position Sensor A Circuit High Input

P0339....Crankshaft Position Sensor A Circuit Intermittent

P0340....Camshaft Position Sensor 'A' Circuit (Bank 1 or Single Sensor)

P0341 Camshaft Position Sensor 'A' Circuit Range/Performance (Bank 1 or Single Sensor)

P0342....Camshaft Position Sensor 'A' Circuit Low Input (Bank 1 or Single Sensor)

P0343....Camshaft Position Sensor 'A' Circuit High Input (Bank 1 or Single Sensor)

P0344....Camshaft Position Sensor 'A' Circuit Intermittent (Bank 1 or Single Sensor)

P0345....Camshaft Position Sensor 'A' Circuit (Bank 2)

P0346....Camshaft Position Sensor 'A' Circuit Range/Performance (Bank 2)

P0347....Camshaft Position Sensor 'A' Circuit Low Input (Bank 2)

P0348....Camshaft Position Sensor 'A' Circuit High Input (Bank 2)

P0349....Camshaft Position Sensor 'A' Circuit Intermittent (Bank 2)

P0350....Ignition Coil Primary/Secondary Circuit

Nov 17, 2010 | Kia Amanti Cars & Trucks

2 Answers

2001 Blazer 4.3L had code 302. but runs fine. Was in need of cap and wires so started with a tune up and cleader code. Code came back, so I replaced fuel inj. assy. and cleared again. Now I have a o2...


code P0302 is cylinder # 2 misfire, code 300 is misfire detected. could be dirty crank sensor or even vacuum leak, I would check for vacuum leak before throwing money on sensors.

Sep 26, 2017 | 2001 Chevrolet Blazer

1 Answer

2004 mini cooper 47.000miles.error code p0301 and p0326 any help would be ace.the car seems to run fine but the engine management light is on.


p0301 is Cylinder 1 Misfire. Check fuel injector,Spark plug, plug wire, ignition coil.

p0326 is the Knock sensor (Combined with above code I'd check the fuel injector on #1 cylinder)

Sep 04, 2010 | 2004 Mini Cooper

2 Answers

I just replaced my o2 senser on my 2001 a4 1.8


you have a O2 sensor problem. You say you replaced the o2 sensor, the one in the front , before the converter? thats bank 1 sensor 1 ...I would not think a O2 would cause misfires????

Oct 14, 2009 | 2001 Audi A4

1 Answer

1999 Nisian Maxima and need to know what codes mean?


P1320 Ignition Signal
Signal wire from distributor
P0325 Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)
O2 senor ( The one before the cat converter )
P0300 Random/Multiple Cylinder Misfire Detected
The misfire detection monitor, a software strategy built into the computer, is designed to detect an engine misfire. The computer can also normally identify the specific cylinder in which the misfire has occurred. A misfire is nothing more than a lack of combustion, which can be caused by poor fuel quality or metering, low compression, lack of spark or unmetered air entering the engine. There are other possible, less obvious causes as well, such as uncommanded Exhaust Gas Recirculatin (EGR), flow. When the misfire monitor detects a misfire, it will trigger the check engine light with the specific cylinder number as the last digit in the P030X code. For instance cylinder 1 misfire is P0301, cylinder 2 is P0302 etc. In this case we have either multiple cylinders misfiring, or the computer simply can't determine the specific cylinder, and as such we are left with the P0300 in computer memory.
Possible Causes:
Fuel injectors, related wiring, sensors and computer issues
Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
Incorrect fuel pressure

EGR system concerns: leaking EGR valve or restricted ports
Base engine concerns: low compression, valve train problems and timing issues
Ignition system concerns including, but not limited to:
Faulty spark plugs
Faulty coil or related wiring
Ignition module or related wiring issues
Ignition related sensor faults or wiring issues

Apr 13, 2009 | 1999 Nissan Maxima

1 Answer

5vz-fe misfire codes


Replace the coil pack.

Dec 26, 2008 | 1999 Toyota 4Runner

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