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2002 Sport Idle Problem (4 Codes)


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February 24, 2013
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Year, Model & Trim Level
2002 XLT Sport 4x4 4.0L
SOLVED: 2002 Sport Idle Problem (4 Codes)

My 2002 Explorer Sport XLT 4x4 4.0L has developed an idle problem. It starts fine when cold and after a five minute warm up it begins to idle up and down and then eventually stalls. It can be driven but acts the same when my foot is off the accelerator pedal.

Previously, the check engine light came on and I've had a local garage do a fault code retrieval (check engine light) and they come up with these codes:

P0102 MAF Signal Low Input to PCM
P1152 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank 2
P1132 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Rich - Bank 1
P1451 EVAP Control System Canister Vent Solenoid Circuit Malfunction

They suggested that I needed new O2 Sensors and gave me a hefty quote.

After reading some forum threads and noticing that my air filter container was unclipped and open, I replaced my air filter, cleaned my Idle Air Control Valve and cleaned my MAF Sensor. Same issue but slightly better idle. I decided to buy a new IAC Valve and this had no effect.

Any ideas where to go from here? Also, where do I find my EVAP Control System Canister Vent Solenoid and how do I troubleshoot it?
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The MAF sensor is the first thing you should look at. Cleaning might not be the answer, replacement may be necessary. The low signal level might be the cause of the rich condition the o2's are reporting.


Thanks for the tip I'll definitely look into replacing the MAF sensor.

PROBLEM SOLVED: I cleaned the MAF sensor and replaced the oxygen sensors and it still ran rough. I could hear a vacuum leak from the motor and noticed that the PCV valve and hose had broken free from the valve cover. Since the plastic fitting was broken, I did a "farmer fix" to reattach it. I replaced the plug and wires and noticed that someone had switched the position of two of the wires so I corrected that. It still ran rough, Finally, I replaced the MAF sensor and bingo all is well. I still need to find a way to permanently fix the PCV hose attachment.
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You want to talk about helpful tips!

Glad you got this working right!