I have some credit to use at Rock Auto and am buying parts for my Dodge. My big question is what to do regarding the O2 sensor. I've been lazy right now and don't know if I have one or two on my truck, which is a 1997 5.2L. I know of the one pre-cat, which I assume is the "downstream" unit. Anyway, here is the list from Rock Auto. I am inclined to buy the Bosch unit unless someone can sway my decision.

DENSO Part # 2344077 FRONT; "w/ 11" Pigtail" $36.79$
STANDARD MOTOR PRODUCTS Part # SG209T {TRU-TECH}
Upstream Sensor; With 12 Inch Lead $39.79
STANDARD MOTOR PRODUCTS Part # SG229T {TRU-TECH}
Two required.; Upstream Sensor; With 18 Inch Lead $39.79
DENSO Part # 2344076 FRONT; "w/ 18" Pigtail" $45.79
STANDARD MOTOR PRODUCTS Part # SG258T {TRU-TECH}
Downstream Sensor; With 12 Inch Lead Downstream Sensor; With 18 Inch Lead $46.79
DENSO Part # 2344079 Rear $50.79
STANDARD MOTOR PRODUCTS Part # SG209 {UPSTREAM SENSOR; 12"}
Upstream Sensor; With 12 Inch Lead $53.79
STANDARD MOTOR PRODUCTS Part # SG229 Two required.; Upstream Sensor; With 18 Inch Lead $53.79
ACDELCO Part # 2131372 {#88929799}SENSOR,HTD OXY(POSN 1) w/M/TRANS; IN EXH MANIFOLD/CROSSOVER-4 WIRE $53.99
STANDARD MOTOR PRODUCTS Part # SG258 {18"}Downstream Sensor; With 12 Inch Lead
Downstream Sensor; With 18 Inch Lead $59.99
BOSCH Part # 15729 {Oxygen Sensor}Right side; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles; Universal Type - Upstream Left side; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles; Universal Type - Upstream $60.79
BOSCH Part # 15730 {Oxygen Sensor}4 Wire; Heated; Check / Replace Interval: 100,000 Miles; Universal Type - Downstream$60.79
BOSCH Part # 13280 {Oxygen Sensor}4 Wire; Heated; Check / Replace Interval: 100,000 Miles; OE Type - Downstream $61.79
BOSCH Part # 13100{Oxygen Sensor}Right side; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles; OE Type - Upstream $64.79
ACDELCO Part # 2131374 {#88929801}SENSOR,HTD OXY(POSN 3) POST CONVERTER-4 WIRE $65.79
BOSCH Part # 15705 {Oxygen Sensor}Left side; 4 Wire; Heated; Check / Replace Interval: 100,000 Miles; OE Type - Upstream $68.79
ACDELCO Part # 2131375 {#88929802}SENSOR,HTD OXY(POSN 1) w/A/TRANS; IN EXH MANIFOLD/CROSSOVER-4 WIRE $81.79

 

The upstream oxygen sensor is the one before the converter, and on my 97 5.2 I have only one oxygen sensor before the converter. My sensor is on the passenger side right in front of the converter, so in my guess I would say get Bosch part # 13100. I have use Bosch before and have had no problems with them at all.

 

That's what I thought. Thanks!

 

I had heard the Bosch ones don't last as long as the NGK (Now NTK,I think) ones. You might want to check if they have that brand.