Delphi ES20321 oxygen sensor for the 1997-1999 Jeep Wrangler 4-cylinder 2.5L, the 1997-2000 Wrangler 6-cylinder 4.0L and other vehicles reads the oxygen level in the exhaust and sends that signal to the engine computer. Every Delphi oxygen sensor is built to Delphi's OE standards.
A worn oxygen sensor can show up as a check engine light, rough running or poor fuel economy, but those signs can have other causes. Before replacing it, look over any wiring and connector you can see, with the engine off and cool, for chafing, melting or corrosion. If the sensor is the cause, this one replaces it.
This sensor is listed for a wide range of Jeep, Dodge, Chrysler and Plymouth models. It is an oxygen sensor replacement for the 1997-1999 Jeep Wrangler 4-cylinder 2.5L and the 1997-2000 Wrangler 6-cylinder 4.0L. It also fits the 1996-1998 Jeep Grand Cherokee 6-cylinder 4.0L or V8 5.2L, the 1998 Grand Cherokee V8 5.9L, the 1996-2000 Jeep Cherokee 4-cylinder 2.5L and the 1996-2001 Cherokee 6-cylinder 4.0L. If your Jeep, Dodge, Chrysler or Plymouth is not named here, run its year and engine through the Buyer's Guide tab.
Fit and size
Build and materials
One oxygen sensor and one instruction sheet. This listing holds one sensor; the 1997-2000 Jeep Wrangler 6-cylinder 4.0L takes one, and the quantity varies by vehicle.
Is this the right Jeep Grand Cherokee oxygen sensor for a 1996-1998 model with the 6-cylinder 4.0L or V8 5.2L engine?
Yes. Delphi ES20321 is listed for the 1996-1998 Jeep Grand Cherokee 6-cylinder 4.0L or V8 5.2L and the 1998 Grand Cherokee V8 5.9L.
Does this Jeep Cherokee oxygen sensor fit a 1996-2000 model with the 4-cylinder 2.5L?
Yes. This oxygen sensor is listed for the 1996-2000 Jeep Cherokee 4-cylinder 2.5L and the 1996-2001 Cherokee 6-cylinder 4.0L.
Does the Delphi ES20321 come with an instruction sheet?
Yes. The Delphi ES20321 package holds one oxygen sensor and one instruction sheet.
Can this oxygen sensor be used with E85 fuel?
Yes. This sensor is validated for all fuel types, including ethanol blends like E85.
How is the ES20321 oxygen sensor tested?
This sensor is tested to 150,000 miles, plus 2,000 hours of severe thermal testing. A patented protective sensor coating helps prevent contamination.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
