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Old 08-15-2011, 12:58 PM
99 Sport 99 Sport is offline
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Default check engine light came on

'99 sport 3.0 engine, 43k miles. check engine light came on last week. had it checked at autozone and a code PO401 showed up. guy said it was the egr valve. bought a new one and installed it on friday. truck ran great,but after 25 miles the light came back on. drove it over 100 miles on sunday and it runs fine.( CEL still on)..went back to autozone this a.m. and now they say its the solenoid...should I change that or get someone to clear the code? autozone will not clear the code, and said "take it to a mechanic"...any ideas guys? thx, Jim....
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Old 08-15-2011, 01:48 PM
FireRanger FireRanger is offline
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Default Re: check engine light came on

That code could be caused by:
- Faulty EGR Valve [ruled out]
- Faulty DPFE Sensor
- Fauly valcuum solenoid, which is what controls the EGR
- Clogged up EGR lines
- Leaking vacuum lines

Take your pick. It's a crap shoot. You can test the vac solenoid and clean the lines yourself to rule some other things out too.
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