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1999 Jeep 4L Grand Cherokee P1494 Error: How Many Drive Cycles Needed to Turn Off Check Engine Light?

Model: Jeep Fault Code: P1494 Posted: 2022-03-24 11:42

After resolving the P1494 error code on my 1999 Jeep 4L Grand Cherokee, I've verified that no new fault codes are stored in the Powertrain Control Module (PCM). However, the check engine light remains illuminated. I'm using an Autophix OM129 scanner. My question is: How many drive cycles or miles must be driven to successfully clear the check engine light after fixing the P1494 issue? Is there a specific driving pattern required? Larry Sheltmire

Related fault codes
P1494
Comments (6)
Anonymous 2022-03-25 10:27

You mentioned the check engine light is on and your scan tool shows no stored codes in the PCM. Did you attempt to clear any existing fault codes?

Anonymous 2022-03-25 10:44

Thanks for the quick reply. The answer is no—I did not clear the codes. The scanner displayed 'no stored codes,' and I took no further action. Larry

Anonymous 2022-03-25 11:37

You initially stated that your check engine light stays on even after resolving the issue—this suggests a persistent fault condition.

Anonymous 2022-03-25 11:40

If the check engine light remains on, it indicates the PCM has detected an ongoing problem. Try using a different OBD2 scan tool or visit a service center like AutoZone to have codes read and diagnosed.

Anonymous 2022-03-25 11:45

A continuously illuminated check engine light means the underlying issue is not fully resolved. OBD2 readiness monitors require code clearing before they can be reset, and driving cycles alone won't fix a persistent fault.

Anonymous 2022-03-26 00:40

Please reply so I can assist you further with troubleshooting steps specific to your vehicle and error code.