Question about 1998 Jeep Wrangler

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Check engine light codes and troubleshooting

98 jeep wrangler 4.0 sport inline 6. the check engine light came on, loss of power on highway. turned it off and then back on and its driving fine now. the codes are p0301, p0302, p0473, & p0171. 301 and 302 are cylinders 1 and 2 misfire, 171 is burning to lean, and 473 is fuel center system sensor? mechanic could not clear check engine light. we just changed plugs, wires, distibutor cap and rotor button. he said he did not no what was going on. help please

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Sounds like you have a vacuum leak for the lean code and the misfires. I don't see a 473 code in my manual, but have a 463. The 463 is for the fuel level sensor open or voltage high.

Posted on Jun 02, 2009

  • edublu Oct 23, 2010

    Throttle position sensor. I had the same issues and found that the wire harness from the tps end had defected/fallen apart. replaced the tps and was good to go

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How to fix 1999 jeep cherokee sport


You mean it cranks but does not start, right ?
The NoBus on the display means the cluster is not talking to the computer. That could be a wiring problem or a component problem.
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My 97 Jeep wrangler 2.5 has loss of power under load 4 & 5th gear it has a hard time keeping at highway speeds cant get it over 2900 RPM slows down with the slightest grade of a hill 1,2 & 3 seem...


I seriously wonder why Jeep used that engine at all. We have several Jeeps here and the only one I hear nearly every week about power and hill climbing problems is the one with the 4cyl. (same year as yours).
Adding a taller tire is definitely not a plus. No idea what your gear ratio is but lets say you have 3:73's...with a tire two inches taller, the actual final ratio is around 3:23. Put the small engine up against it and you have about as much grade or hill climbing ability as a ride on mower!
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1 Answer

I have a 98 TJ 2.5, does anyone know if it has another numbers in the chassi? (except the three plates inside the car) tnanks


hi no there is only the ones on the inside the layout should be like this for your one


1 Country of Origin 1 = United States 2 Make J = Jeep 3 Vehicle Type 4 = MPV 4 Gross Vehicle Weight Rating E = 3001-4000 lbs.
F = 4001-5000 lbs. 5 Vehicle Line Y = Wrangler 4×4 6 Series 1 = Sport
2 = SE
4 = Sahara 7 Body Style 9 = Open body 8 Engine P = 2.5L Unleaded Gasoline
S = 4.0L Unleaded Gasoline 9 Check Digit 0 through 9, or X 10 Model Year W = 1998 11 Assembly Plant P = Toledo #2 12-17 Vehicle Build Sequence Six Digit Number

incase the picture did not come out

1 Country of Origin 1 = United States
2 Make J = Jeep
3 Vehicle Type 4 = MPV
4 Gross Vehicle Weight Rating E = 3001-4000 lbs.
F = 4001-5000 lbs.
5 Vehicle Line Y = Wrangler 4×4
6 Series 1 = Sport
2 = SE
4 = Sahara
7 Body Style 9 = Open body
8 Engine P = 2.5L Unleaded Gasoline
S = 4.0L Unleaded Gasoline
9 Check Digit 0 through 9, or X
10 Model Year W = 1998
11 Assembly Plant P = Toledo #2
12-17 Vehicle Build Sequence Six Digit Number

hope this helps.

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Yes, that actually was an option for the jeep. A 4.0 inline 6cyclinder. Should be pretty straigh forward

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   What engine is in the Jeep. 4 or 6 cyl?  how many miles or her? May be a timing chain concern but i will need the asked for info.

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1 Answer

1998 Jeep Wrangler Sport codes P0121 and P0122


did you check voltage to sensors if you need help with proedure, contact me, or you may try patrs houses on line in how to section.

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