2003 Jaguar X-Type check engine light on

BWR1261

MEMBER
2003 JAGUAR X-TYPE
99,000 MILES

Ok so ive had my jaguar for about 2 weeks. It is a 2003 jaguar x type. Ive been running regular 87 grade unleaded gasoline in my car and had the light just come on today out of nowhere. I had it plugged up to an engine diagnostic code reader and it told me my fuel was too lean. So I wanted to know if I put the 93 grade recommended premium gasoline in with the quarter tank of 87 grade fuel will that fix my problem and get my check engine light to go off or should I run the 87 grade gasoline out before refueling with the recommended 93 premium fuel?

3 Replies

HMAC300

MECHANIC
48,601 POSTS

Have your fuel pressure checked, different grades are of no help

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Thursday, October 24th, 2013 AT 6:12 AM

BWR1261

MEMBER
2 POSTS

Whoever u are u dont know anything about vehicles ive already had my computer plugged up to it the gasoline im using now is too low a octane rating and is causing my engine light to come on thanks but no thanks

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Thursday, October 24th, 2013 AT 10:55 AM

HMAC300

MECHANIC
48,601 POSTS

Because you have a jag you are probably supposed to use premium fuel how ever if you are getting a lean code premium fuel will not cure that that is a sign of low fuel pressure or an injector problem. Most of the time it's low fuel pressure which on your car should be 47.9psi minimum at idle. If not it will cause the p0171 or 174 doe to come on. However you are a genius and I know your cars run as you diagnose what is wrong with them by changing fuel while you drive.

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Thursday, October 24th, 2013 AT 11:53 AM