jdt70
New Member
- Joined
- May 13, 2007
- Messages
- 4
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- Year, Model & Trim Level
- 1994 4 door
I thought I would run this by you guys before I started buying parts. I am having a problem with my ’94 Explorer. The check engine light comes on and engine bogs down intermittently after driving several hundred miles. This occurred again recently when I drove it from NC to MI. I was able to pull the OBD 1 codes and this is what I got:
Key on Engine Off (KOEO) test:
Current codes – 335 EGR sensor circuit voltage higher or lower than expected.
Stored Codes (cont. memory) – 172 Heated oxygen sensor fault / lean bank 1 / right side
173 Heated oxygen sensor fault / rich bank 1 / right side
Key on Engine Running (KOER) test:
336 EGR circuit higher than expected / exhaust pressure high
All other test normal
I am guessing that the exhaust pressure high (and maybe the other codes) are due to a plugged catalytic converter. What do you think? Should I change or punch out the cat? Could the O2 sensors be related to the back pressure? If you get a chance let me know. If the O2 sensors are telling the EEC that I am rich or lean that would explain the bog down. Thanks for any recommendations.
Key on Engine Off (KOEO) test:
Current codes – 335 EGR sensor circuit voltage higher or lower than expected.
Stored Codes (cont. memory) – 172 Heated oxygen sensor fault / lean bank 1 / right side
173 Heated oxygen sensor fault / rich bank 1 / right side
Key on Engine Running (KOER) test:
336 EGR circuit higher than expected / exhaust pressure high
All other test normal
I am guessing that the exhaust pressure high (and maybe the other codes) are due to a plugged catalytic converter. What do you think? Should I change or punch out the cat? Could the O2 sensors be related to the back pressure? If you get a chance let me know. If the O2 sensors are telling the EEC that I am rich or lean that would explain the bog down. Thanks for any recommendations.