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1997 Dodge Stratus P0420 Code: Tachometer, Odometer & Gear Selector Failure Explained

Model: 97 dodge stratus Fault Code: P0420 Posted: 2005-08-22 19:49

I own a 1997 Dodge Stratus. Within the first 50 miles of driving, my tachometer stops working and both the odometer and gear selector lights fail. Immediately after this occurs, the check engine light activates and sets a P0420 code. I have an OBD-II scanner that confirms the P0420 code is related to catalytic converter efficiency. However, I'm trying to understand how these two issues—failure of instrument cluster functions (tachometer, odometer) and the P0420 emissions fault—are connected. Is there a known wiring or electronic system link between the vehicle's instrumentation and emission control systems? Could this be due to a faulty instrument cluster, a grounding issue, or a shared power/ground circuit?

Related fault codes
P0420
Comments (3)
Anonymous 2005-08-23 09:30

There is no direct technical connection between P0420 and the tachometer or instrument cluster failure. The P0420 code specifically indicates a catalytic converter efficiency issue, which is unrelated to instrument panel operation. This appears to be coincidental. A faulty instrument cluster, poor wiring harness connections, or a shared power supply issue are more likely causes of both the display failures and intermittent electrical behavior.

Anonymous 2005-10-14 16:50

I'm experiencing exactly the same symptoms on my 1997 Dodge Stratus. The tachometer, odometer, and gear selector lights fail during the first 50 miles of a drive, followed by a check engine light. I haven't confirmed the exact code yet, but it seems to trigger around that point. I'm wondering if anyone has found a solution or fix for this issue. Did you manage to resolve it? Any advice would be greatly appreciated.

Anonymous 2008-04-19 19:45

I also have a 1997 Dodge Stratus with identical symptoms. Over time, I've noticed seasonal differences: during winter months (around 30°F), the tachometer and odometer work normally. In summer heat, they fail more frequently. Recently, when both instruments are working, turning on headlights causes the speedometer needle to flicker by about 5 mph for 5–10 minutes. Interestingly, once the check engine light stopped coming on, I started getting erratic O2 sensor readings. This makes it difficult to determine when to change oil during warmer months. I've taken it to a mechanic who suggested replacing the 'brain' (instrument cluster), but he charges $600 for such a diagnosis—likely an overestimate. My car is a 2.5L V6 with 167,000 miles. Any insights would be helpful.